diff --git a/benchmark/src/generation.rs b/benchmark/src/generation.rs
index 67afa04e..ea7c9778 100644
--- a/benchmark/src/generation.rs
+++ b/benchmark/src/generation.rs
@@ -163,7 +163,7 @@ async fn prefill(
 
     // Run prefill
     let start_time = Instant::now();
-    let (_, decode_batch) = client.prefill(batch.clone()).await?;
+    let (_, decode_batch, _) = client.prefill(batch.clone()).await?;
 
     // Get latency
     let latency = start_time.elapsed();
diff --git a/proto/generate.proto b/proto/generate.proto
index 19ec059b..02f3b2e8 100644
--- a/proto/generate.proto
+++ b/proto/generate.proto
@@ -182,6 +182,12 @@ message PrefillResponse {
     repeated Generation generations = 1;
     /// Next batch (cached)
     optional CachedBatch batch = 2;
+    /// Forward elapsed time in nanoseconds
+    uint64 forward_ns = 3;
+    /// Decode elapsed time in nanoseconds
+    uint64 decode_ns = 4;
+    /// Total elapsed time in nanoseconds
+    uint64 total_ns = 5;
 }
 
 message DecodeRequest {
@@ -194,6 +200,14 @@ message DecodeResponse {
     repeated Generation generations = 1;
     /// Next batch (cached)
     optional CachedBatch batch = 2;
+    /// Forward elapsed time in nanoseconds
+    uint64 forward_ns = 3;
+    /// Decode elapsed time in nanoseconds
+    uint64 decode_ns = 4;
+    /// Total elapsed time in nanoseconds
+    uint64 total_ns = 5;
+    /// Concatenate elapsed time in nanoseconds
+    optional uint64 concat_ns = 6;
 }
 
 message WarmupRequest {
diff --git a/router/client/src/client.rs b/router/client/src/client.rs
index 1560f19c..898e2b11 100644
--- a/router/client/src/client.rs
+++ b/router/client/src/client.rs
@@ -4,6 +4,7 @@ use crate::pb::generate::v2::*;
 use crate::Result;
 use grpc_metadata::InjectTelemetryContext;
 use std::cmp::min;
+use std::time::Duration;
 use tonic::transport::{Channel, Uri};
 use tracing::instrument;
 
@@ -157,10 +158,14 @@ impl Client {
     pub async fn prefill(
         &mut self,
         batch: Batch,
-    ) -> Result<(Vec<Generation>, Option<CachedBatch>)> {
+    ) -> Result<(Vec<Generation>, Option<CachedBatch>, PrefillTimings)> {
         let request = tonic::Request::new(PrefillRequest { batch: Some(batch) }).inject_context();
         let response = self.stub.prefill(request).await?.into_inner();
-        Ok((response.generations, response.batch))
+        Ok((
+            response.generations,
+            response.batch,
+            PrefillTimings::new(response.forward_ns, response.decode_ns, response.total_ns),
+        ))
     }
 
     /// Generate one token for each request in the given cached batches
@@ -171,9 +176,52 @@ impl Client {
     pub async fn decode(
         &mut self,
         batches: Vec<CachedBatch>,
-    ) -> Result<(Vec<Generation>, Option<CachedBatch>)> {
+    ) -> Result<(Vec<Generation>, Option<CachedBatch>, DecodeTimings)> {
         let request = tonic::Request::new(DecodeRequest { batches }).inject_context();
         let response = self.stub.decode(request).await?.into_inner();
-        Ok((response.generations, response.batch))
+        Ok((
+            response.generations,
+            response.batch,
+            DecodeTimings::new(
+                response.concat_ns,
+                response.forward_ns,
+                response.decode_ns,
+                response.total_ns,
+            ),
+        ))
+    }
+}
+
+pub struct PrefillTimings {
+    pub forward: Duration,
+    pub decode: Duration,
+    pub total: Duration,
+}
+
+impl PrefillTimings {
+    fn new(forward_ns: u64, decode_ns: u64, total_ns: u64) -> Self {
+        Self {
+            forward: Duration::from_nanos(forward_ns),
+            decode: Duration::from_nanos(decode_ns),
+            total: Duration::from_nanos(total_ns),
+        }
+    }
+}
+
+pub struct DecodeTimings {
+    pub concat: Option<Duration>,
+    pub forward: Duration,
+    pub decode: Duration,
+    pub total: Duration,
+}
+
+impl DecodeTimings {
+    fn new(concat_ns: Option<u64>, forward_ns: u64, decode_ns: u64, total_ns: u64) -> Self {
+        Self {
+            concat: concat_ns.map(|v| Duration::from_nanos(v)),
+            forward: Duration::from_nanos(forward_ns),
+            decode: Duration::from_nanos(decode_ns),
+            total: Duration::from_nanos(total_ns),
+        }
     }
 }
diff --git a/router/client/src/sharded_client.rs b/router/client/src/sharded_client.rs
index b4bdcd42..6c5da3c7 100644
--- a/router/client/src/sharded_client.rs
+++ b/router/client/src/sharded_client.rs
@@ -1,3 +1,4 @@
+use crate::client::{DecodeTimings, PrefillTimings};
 /// Multi shard Client
 use crate::{Batch, CachedBatch, Client, Generation, HealthResponse, ShardInfo};
 use crate::{ClientError, Result};
@@ -116,49 +117,63 @@ impl ShardedClient {
     ///
     /// Returns Generation for each request in batch
     /// and the next cached batch
-    #[instrument(skip_all, fields(id = &batch.id, size = &batch.size))]
+    #[instrument(skip_all, fields(id = & batch.id, size = & batch.size))]
     pub async fn prefill(
         &mut self,
         batch: Batch,
-    ) -> Result<(Vec<Generation>, Option<CachedBatch>)> {
+    ) -> Result<(Vec<Generation>, Option<CachedBatch>, PrefillTimings)> {
         let futures: Vec<_> = self
             .clients
             .iter_mut()
             .map(|client| Box::pin(client.prefill(batch.clone())))
             .collect();
-        let results: Result<Vec<(Vec<Generation>, Option<CachedBatch>)>> =
+        let results: Result<Vec<(Vec<Generation>, Option<CachedBatch>, PrefillTimings)>> =
             join_all(futures).await.into_iter().collect();
-        merge_generations(results?)
+        let mut results = results?;
+
+        let (mut generations, next_batch, mut timings) =
+            results.pop().ok_or(ClientError::EmptyResults)?;
+
+        // Merge generations from different model shards
+        for (mut shard_generations, _, shard_timings) in results.into_iter() {
+            generations.append(&mut shard_generations);
+            // Return the timings of the slowest shard
+            if shard_timings.total > timings.total {
+                timings = shard_timings;
+            }
+        }
+        Ok((generations, next_batch, timings))
     }
 
     /// Generate one token for each request in the given cached batches
     ///
     /// Returns Generation for each request in batches
     /// and the next cached batch
-    #[instrument(skip_all, fields(size = batches.iter().map(|batch|{batch.size}).sum::<u32>()))]
+    #[instrument(skip_all, fields(size = batches.iter().map(| batch | {batch.size}).sum::< u32 > ()))]
     pub async fn decode(
         &mut self,
         batches: Vec<CachedBatch>,
-    ) -> Result<(Vec<Generation>, Option<CachedBatch>)> {
+    ) -> Result<(Vec<Generation>, Option<CachedBatch>, DecodeTimings)> {
         let futures: Vec<_> = self
             .clients
             .iter_mut()
             .map(|client| Box::pin(client.decode(batches.clone())))
             .collect();
-        let results: Result<Vec<(Vec<Generation>, Option<CachedBatch>)>> =
+        let results: Result<Vec<(Vec<Generation>, Option<CachedBatch>, DecodeTimings)>> =
             join_all(futures).await.into_iter().collect();
-        merge_generations(results?)
+        let mut results = results?;
+
+        let (mut generations, next_batch, mut timings) =
+            results.pop().ok_or(ClientError::EmptyResults)?;
+
+        // Merge generations from different model shards
+        for (mut shard_generations, _, shard_timings) in results.into_iter() {
+            generations.append(&mut shard_generations);
+            // Return the timings of the slowest shard
+            if shard_timings.total > timings.total {
+                timings = shard_timings;
+            }
+        }
+        Ok((generations, next_batch, timings))
     }
 }
-
-/// Merge generations from the different model shards
-fn merge_generations(
-    mut results: Vec<(Vec<Generation>, Option<CachedBatch>)>,
-) -> Result<(Vec<Generation>, Option<CachedBatch>)> {
-    let (mut generations, next_batch) = results.pop().ok_or(ClientError::EmptyResults)?;
-
-    for (mut shard_generations, _) in results.into_iter() {
-        generations.append(&mut shard_generations);
-    }
-    Ok((generations, next_batch))
-}
diff --git a/router/src/infer.rs b/router/src/infer.rs
index 2e199ce2..bf5920da 100644
--- a/router/src/infer.rs
+++ b/router/src/infer.rs
@@ -379,15 +379,20 @@ async fn prefill(
     metrics::increment_counter!("tgi_batch_inference_count", "method" => "prefill");
 
     match client.prefill(batch).await {
-        Ok((generations, next_batch)) => {
+        Ok((generations, next_batch, timings)) => {
             // Update health
             generation_health.store(true, Ordering::SeqCst);
+
+            let start_filtering_time = Instant::now();
             // Send generated tokens and filter stopped entries
             filter_send_generations(generations, entries);
 
             // Filter next batch and remove requests that were stopped
             let next_batch = filter_batch(client, next_batch, entries).await;
 
+            metrics::histogram!("tgi_batch_forward_duration", timings.forward.as_secs_f64(), "method" => "prefill");
+            metrics::histogram!("tgi_batch_decode_duration", timings.decode.as_secs_f64(), "method" => "prefill");
+            metrics::histogram!("tgi_batch_filter_duration", start_filtering_time.elapsed().as_secs_f64(), "method" => "prefill");
             metrics::histogram!("tgi_batch_inference_duration", start_time.elapsed().as_secs_f64(), "method" => "prefill");
             metrics::increment_counter!("tgi_batch_inference_success", "method" => "prefill");
             next_batch
@@ -416,15 +421,23 @@ async fn decode(
     metrics::increment_counter!("tgi_batch_inference_count", "method" => "decode");
 
     match client.decode(batches).await {
-        Ok((generations, next_batch)) => {
+        Ok((generations, next_batch, timings)) => {
             // Update health
             generation_health.store(true, Ordering::SeqCst);
+
+            let start_filtering_time = Instant::now();
             // Send generated tokens and filter stopped entries
             filter_send_generations(generations, entries);
 
             // Filter next batch and remove requests that were stopped
             let next_batch = filter_batch(client, next_batch, entries).await;
 
+            if let Some(concat_duration) = timings.concat {
+                metrics::histogram!("tgi_batch_concat_duration", concat_duration.as_secs_f64(), "method" => "decode");
+            }
+            metrics::histogram!("tgi_batch_forward_duration", timings.forward.as_secs_f64(), "method" => "decode");
+            metrics::histogram!("tgi_batch_decode_duration", timings.decode.as_secs_f64(), "method" => "decode");
+            metrics::histogram!("tgi_batch_filter_duration", start_filtering_time.elapsed().as_secs_f64(), "method" => "decode");
             metrics::histogram!("tgi_batch_inference_duration", start_time.elapsed().as_secs_f64(), "method" => "decode");
             metrics::increment_counter!("tgi_batch_inference_success", "method" => "decode");
             next_batch
diff --git a/router/src/validation.rs b/router/src/validation.rs
index 1b47fc97..90dc3741 100644
--- a/router/src/validation.rs
+++ b/router/src/validation.rs
@@ -540,7 +540,7 @@ mod tests {
         let max_stop_sequence = 3;
         let max_top_n_tokens = 4;
         let max_input_length = 5;
-        let max_total_tokens = 6;
+        let max_total_tokens = 106;
         let workers = 1;
         let validation = Validation::new(
             workers,
@@ -600,7 +600,7 @@ mod tests {
         let max_stop_sequences = 3;
         let max_top_n_tokens = 4;
         let max_input_length = 5;
-        let max_total_tokens = 6;
+        let max_total_tokens = 106;
         let workers = 1;
         let validation = Validation::new(
             workers,
diff --git a/server/tests/models/test_bloom.py b/server/tests/models/test_bloom.py
index d9a33795..66df708a 100644
--- a/server/tests/models/test_bloom.py
+++ b/server/tests/models/test_bloom.py
@@ -103,7 +103,7 @@ def test_causal_lm_batch_type(default_bloom):
 
 def test_causal_lm_generate_token(default_bloom, default_bloom_batch):
     sequence_length = len(default_bloom_batch.all_input_ids[0])
-    generations, next_batch = default_bloom.generate_token(default_bloom_batch)
+    generations, next_batch, _ = default_bloom.generate_token(default_bloom_batch)
 
     assert len(generations) == len(default_bloom_batch)
     assert isinstance(next_batch, CausalLMBatch)
@@ -153,10 +153,10 @@ def test_causal_lm_generate_token(default_bloom, default_bloom_batch):
 def test_causal_lm_generate_token_completion(default_bloom, default_bloom_batch):
     next_batch = default_bloom_batch
     for _ in range(default_bloom_batch.stopping_criterias[0].max_new_tokens - 1):
-        generations, next_batch = default_bloom.generate_token(next_batch)
+        generations, next_batch, _ = default_bloom.generate_token(next_batch)
         assert len(generations) == len(default_bloom_batch)
 
-    generations, next_batch = default_bloom.generate_token(next_batch)
+    generations, next_batch, _ = default_bloom.generate_token(next_batch)
     assert next_batch is None
 
     assert len(generations) == 1
@@ -178,10 +178,10 @@ def test_causal_lm_generate_token_completion_multi(
     for i in range(
         default_multi_requests_bloom_batch.stopping_criterias[1].max_new_tokens - 1
     ):
-        generations, next_batch = default_bloom.generate_token(next_batch)
+        generations, next_batch, _ = default_bloom.generate_token(next_batch)
         assert len(generations) == len(default_multi_requests_bloom_batch)
 
-    generations, next_batch = default_bloom.generate_token(next_batch)
+    generations, next_batch, _ = default_bloom.generate_token(next_batch)
     assert next_batch is not None
 
     assert len(generations) == 2
@@ -201,10 +201,10 @@ def test_causal_lm_generate_token_completion_multi(
     for _ in range(
         stopping_criterias[0].max_new_tokens - stopping_criterias[1].max_new_tokens - 1
     ):
-        generations, next_batch = default_bloom.generate_token(next_batch)
+        generations, next_batch, _ = default_bloom.generate_token(next_batch)
         assert len(generations) == len(next_batch)
 
-    generations, next_batch = default_bloom.generate_token(next_batch)
+    generations, next_batch, _ = default_bloom.generate_token(next_batch)
     assert next_batch is None
 
     assert len(generations) == 1
@@ -224,11 +224,11 @@ def test_batch_concatenate(
     default_bloom, default_bloom_batch, default_multi_requests_bloom_batch
 ):
     next_batch_0 = default_bloom_batch
-    _, next_batch_0 = default_bloom.generate_token(next_batch_0)
-    _, next_batch_0 = default_bloom.generate_token(next_batch_0)
+    _, next_batch_0, _ = default_bloom.generate_token(next_batch_0)
+    _, next_batch_0, _ = default_bloom.generate_token(next_batch_0)
 
     next_batch_1 = default_multi_requests_bloom_batch
-    _, next_batch_1 = default_bloom.generate_token(next_batch_1)
+    _, next_batch_1, _ = default_bloom.generate_token(next_batch_1)
 
     # Clone past_key_values before concatenating to compare after,
     # because they are removed from the concatenated batches
@@ -288,10 +288,10 @@ def test_batch_concatenate(
     for _ in range(
         default_multi_requests_bloom_batch.stopping_criterias[1].max_new_tokens - 2
     ):
-        generations, next_batch = default_bloom.generate_token(next_batch)
+        generations, next_batch, _ = default_bloom.generate_token(next_batch)
         assert len(generations) == len(next_batch)
 
-    generations, next_batch = default_bloom.generate_token(next_batch)
+    generations, next_batch, _ = default_bloom.generate_token(next_batch)
     assert next_batch is not None
 
     assert len(generations) == 3
@@ -313,10 +313,10 @@ def test_batch_concatenate(
         - default_multi_requests_bloom_batch.stopping_criterias[1].max_new_tokens
         - 2
     ):
-        generations, next_batch = default_bloom.generate_token(next_batch)
+        generations, next_batch, _ = default_bloom.generate_token(next_batch)
         assert len(generations) == len(next_batch)
 
-    generations, next_batch = default_bloom.generate_token(next_batch)
+    generations, next_batch, _ = default_bloom.generate_token(next_batch)
     assert next_batch is not None
 
     assert len(generations) == 2
@@ -337,10 +337,10 @@ def test_batch_concatenate(
         - default_multi_requests_bloom_batch.stopping_criterias[1].max_new_tokens
         - 4
     ):
-        generations, next_batch = default_bloom.generate_token(next_batch)
+        generations, next_batch, _ = default_bloom.generate_token(next_batch)
         assert len(generations) == len(next_batch)
 
-    generations, next_batch = default_bloom.generate_token(next_batch)
+    generations, next_batch, _ = default_bloom.generate_token(next_batch)
     assert next_batch is None
 
     assert len(generations) == 1
diff --git a/server/tests/models/test_causal_lm.py b/server/tests/models/test_causal_lm.py
index 8b45e781..250fa354 100644
--- a/server/tests/models/test_causal_lm.py
+++ b/server/tests/models/test_causal_lm.py
@@ -99,7 +99,9 @@ def test_causal_lm_batch_type(default_causal_lm):
 
 def test_causal_lm_generate_token(default_causal_lm, default_causal_lm_batch):
     sequence_length = len(default_causal_lm_batch.all_input_ids[0])
-    generations, next_batch = default_causal_lm.generate_token(default_causal_lm_batch)
+    generations, next_batch, _ = default_causal_lm.generate_token(
+        default_causal_lm_batch
+    )
 
     assert len(generations) == len(next_batch)
     assert isinstance(next_batch, CausalLMBatch)
@@ -151,10 +153,10 @@ def test_causal_lm_generate_token_completion(
 ):
     next_batch = default_causal_lm_batch
     for _ in range(default_causal_lm_batch.stopping_criterias[0].max_new_tokens - 1):
-        generations, next_batch = default_causal_lm.generate_token(next_batch)
+        generations, next_batch, _ = default_causal_lm.generate_token(next_batch)
         assert len(generations) == len(next_batch)
 
-    generations, next_batch = default_causal_lm.generate_token(next_batch)
+    generations, next_batch, _ = default_causal_lm.generate_token(next_batch)
     assert next_batch is None
 
     assert len(generations) == 1
@@ -174,10 +176,10 @@ def test_causal_lm_generate_token_completion_multi(
     for i in range(
         default_multi_requests_causal_lm_batch.stopping_criterias[1].max_new_tokens - 1
     ):
-        generations, next_batch = default_causal_lm.generate_token(next_batch)
+        generations, next_batch, _ = default_causal_lm.generate_token(next_batch)
         assert len(generations) == len(next_batch)
 
-    generations, next_batch = default_causal_lm.generate_token(next_batch)
+    generations, next_batch, _ = default_causal_lm.generate_token(next_batch)
     assert next_batch is not None
 
     assert len(generations) == 2
@@ -200,10 +202,10 @@ def test_causal_lm_generate_token_completion_multi(
     for _ in range(
         stopping_criterias[0].max_new_tokens - stopping_criterias[1].max_new_tokens - 1
     ):
-        generations, next_batch = default_causal_lm.generate_token(next_batch)
+        generations, next_batch, _ = default_causal_lm.generate_token(next_batch)
         assert len(generations) == len(next_batch)
 
-    generations, next_batch = default_causal_lm.generate_token(next_batch)
+    generations, next_batch, _ = default_causal_lm.generate_token(next_batch)
     assert next_batch is None
 
     assert len(generations) == 1
@@ -222,11 +224,11 @@ def test_batch_concatenate(
     default_causal_lm, default_causal_lm_batch, default_multi_requests_causal_lm_batch
 ):
     next_batch_0 = default_causal_lm_batch
-    _, next_batch_0 = default_causal_lm.generate_token(next_batch_0)
-    _, next_batch_0 = default_causal_lm.generate_token(next_batch_0)
+    _, next_batch_0, _ = default_causal_lm.generate_token(next_batch_0)
+    _, next_batch_0, _ = default_causal_lm.generate_token(next_batch_0)
 
     next_batch_1 = default_multi_requests_causal_lm_batch
-    _, next_batch_1 = default_causal_lm.generate_token(next_batch_1)
+    _, next_batch_1, _ = default_causal_lm.generate_token(next_batch_1)
 
     # Clone past_key_values before concatenating to compare after,
     # because they are removed from the concatenated batches
@@ -285,10 +287,10 @@ def test_batch_concatenate(
     for _ in range(
         default_multi_requests_causal_lm_batch.stopping_criterias[1].max_new_tokens - 2
     ):
-        generations, next_batch = default_causal_lm.generate_token(next_batch)
+        generations, next_batch, _ = default_causal_lm.generate_token(next_batch)
         assert len(generations) == len(next_batch)
 
-    generations, next_batch = default_causal_lm.generate_token(next_batch)
+    generations, next_batch, _ = default_causal_lm.generate_token(next_batch)
     assert next_batch is not None
 
     assert len(generations) == 3
@@ -311,10 +313,10 @@ def test_batch_concatenate(
         - default_multi_requests_causal_lm_batch.stopping_criterias[1].max_new_tokens
         - 2
     ):
-        generations, next_batch = default_causal_lm.generate_token(next_batch)
+        generations, next_batch, _ = default_causal_lm.generate_token(next_batch)
         assert len(generations) == len(next_batch)
 
-    generations, next_batch = default_causal_lm.generate_token(next_batch)
+    generations, next_batch, _ = default_causal_lm.generate_token(next_batch)
     assert next_batch is not None
 
     assert len(generations) == 2
@@ -333,10 +335,10 @@ def test_batch_concatenate(
         - default_multi_requests_causal_lm_batch.stopping_criterias[1].max_new_tokens
         - 4
     ):
-        generations, next_batch = default_causal_lm.generate_token(next_batch)
+        generations, next_batch, _ = default_causal_lm.generate_token(next_batch)
         assert len(generations) == len(next_batch)
 
-    generations, next_batch = default_causal_lm.generate_token(next_batch)
+    generations, next_batch, _ = default_causal_lm.generate_token(next_batch)
     assert next_batch is None
 
     assert len(generations) == 1
diff --git a/server/tests/models/test_santacoder.py b/server/tests/models/test_santacoder.py
index fceec560..1e40e766 100644
--- a/server/tests/models/test_santacoder.py
+++ b/server/tests/models/test_santacoder.py
@@ -55,10 +55,10 @@ def test_santacoder_generate_token_completion(default_santacoder, default_pb_bat
     next_batch = batch
 
     for _ in range(batch.stopping_criterias[0].max_new_tokens - 1):
-        generations, next_batch = default_santacoder.generate_token(next_batch)
+        generations, next_batch, _ = default_santacoder.generate_token(next_batch)
         assert len(generations) == len(next_batch)
 
-    generations, next_batch = default_santacoder.generate_token(next_batch)
+    generations, next_batch, _ = default_santacoder.generate_token(next_batch)
     assert next_batch is None
 
     assert len(generations) == 1
@@ -83,10 +83,10 @@ def test_fim_santacoder_generate_token_completion(
     next_batch = batch
 
     for _ in range(batch.stopping_criterias[0].max_new_tokens - 1):
-        generations, next_batch = default_santacoder.generate_token(next_batch)
+        generations, next_batch, _ = default_santacoder.generate_token(next_batch)
         assert len(generations) == len(next_batch)
 
-    generations, next_batch = default_santacoder.generate_token(next_batch)
+    generations, next_batch, _ = default_santacoder.generate_token(next_batch)
     assert next_batch is None
 
     assert len(generations) == 1
diff --git a/server/tests/models/test_seq2seq_lm.py b/server/tests/models/test_seq2seq_lm.py
index 373867c7..735ab5eb 100644
--- a/server/tests/models/test_seq2seq_lm.py
+++ b/server/tests/models/test_seq2seq_lm.py
@@ -103,7 +103,7 @@ def test_seq2seq_lm_batch_type(default_seq2seq_lm):
 
 def test_seq2seq_lm_generate_token(default_seq2seq_lm, default_seq2seq_lm_batch):
     sequence_length = len(default_seq2seq_lm_batch.input_ids[0])
-    generations, next_batch = default_seq2seq_lm.generate_token(
+    generations, next_batch, _ = default_seq2seq_lm.generate_token(
         default_seq2seq_lm_batch
     )
 
@@ -173,10 +173,10 @@ def test_seq2seq_lm_generate_token_completion(
 ):
     next_batch = default_seq2seq_lm_batch
     for _ in range(6):
-        generations, next_batch = default_seq2seq_lm.generate_token(next_batch)
+        generations, next_batch, _ = default_seq2seq_lm.generate_token(next_batch)
         assert len(generations) == len(next_batch)
 
-    generations, next_batch = default_seq2seq_lm.generate_token(next_batch)
+    generations, next_batch, _ = default_seq2seq_lm.generate_token(next_batch)
     assert next_batch is None
 
     assert len(generations) == 1
@@ -191,10 +191,10 @@ def test_seq2seq_lm_generate_token_completion_multi(
     next_batch = default_multi_requests_seq2seq_lm_batch
 
     for i in range(4):
-        generations, next_batch = default_seq2seq_lm.generate_token(next_batch)
+        generations, next_batch, _ = default_seq2seq_lm.generate_token(next_batch)
         assert len(generations) == len(next_batch)
 
-    generations, next_batch = default_seq2seq_lm.generate_token(next_batch)
+    generations, next_batch, _ = default_seq2seq_lm.generate_token(next_batch)
     assert next_batch is not None
 
     assert len(generations) == 2
@@ -207,10 +207,10 @@ def test_seq2seq_lm_generate_token_completion_multi(
 
     next_batch = next_batch.filter([next_batch.requests[0].id])
 
-    generations, next_batch = default_seq2seq_lm.generate_token(next_batch)
+    generations, next_batch, _ = default_seq2seq_lm.generate_token(next_batch)
     assert len(generations) == len(next_batch)
 
-    generations, next_batch = default_seq2seq_lm.generate_token(next_batch)
+    generations, next_batch, _ = default_seq2seq_lm.generate_token(next_batch)
     assert next_batch is None
 
     assert len(generations) == 1
@@ -228,11 +228,11 @@ def test_batch_concatenate(
     default_multi_requests_seq2seq_lm_batch,
 ):
     next_batch_0 = default_seq2seq_lm_batch
-    _, next_batch_0 = default_seq2seq_lm.generate_token(next_batch_0)
-    _, next_batch_0 = default_seq2seq_lm.generate_token(next_batch_0)
+    _, next_batch_0, _ = default_seq2seq_lm.generate_token(next_batch_0)
+    _, next_batch_0, _ = default_seq2seq_lm.generate_token(next_batch_0)
 
     next_batch_1 = default_multi_requests_seq2seq_lm_batch
-    _, next_batch_1 = default_seq2seq_lm.generate_token(next_batch_1)
+    _, next_batch_1, _ = default_seq2seq_lm.generate_token(next_batch_1)
 
     # Copy hidden state because it is removed from the concatenated branches
     next_batch_0_encoder_last_hidden_state = next_batch_0.encoder_last_hidden_state
@@ -324,10 +324,10 @@ def test_batch_concatenate(
         )
 
     for _ in range(3):
-        generations, next_batch = default_seq2seq_lm.generate_token(next_batch)
+        generations, next_batch, _ = default_seq2seq_lm.generate_token(next_batch)
         assert len(generations) == len(next_batch)
 
-    generations, next_batch = default_seq2seq_lm.generate_token(next_batch)
+    generations, next_batch, _ = default_seq2seq_lm.generate_token(next_batch)
     assert next_batch is not None
 
     assert len(generations) == 3
@@ -342,7 +342,7 @@ def test_batch_concatenate(
         [next_batch.requests[0].id, next_batch.requests[1].id]
     )
 
-    generations, next_batch = default_seq2seq_lm.generate_token(next_batch)
+    generations, next_batch, _ = default_seq2seq_lm.generate_token(next_batch)
     assert next_batch is not None
 
     assert len(generations) == 2
@@ -352,7 +352,7 @@ def test_batch_concatenate(
 
     next_batch = next_batch.filter([next_batch.requests[1].id])
 
-    generations, next_batch = default_seq2seq_lm.generate_token(next_batch)
+    generations, next_batch, _ = default_seq2seq_lm.generate_token(next_batch)
     assert next_batch is None
 
     assert len(generations) == 1
diff --git a/server/text_generation_server/models/causal_lm.py b/server/text_generation_server/models/causal_lm.py
index b771264b..7b10256c 100644
--- a/server/text_generation_server/models/causal_lm.py
+++ b/server/text_generation_server/models/causal_lm.py
@@ -1,6 +1,5 @@
-from text_generation_server.utils.tokens import batch_top_tokens
 import torch
-import inspect
+import time
 
 from dataclasses import dataclass
 from opentelemetry import trace
@@ -8,6 +7,7 @@ from transformers import AutoTokenizer, AutoModelForCausalLM, PreTrainedTokenize
 from typing import Optional, Tuple, List, Type, Dict
 
 from text_generation_server.models import Model
+from text_generation_server.utils.tokens import batch_top_tokens
 from text_generation_server.models.types import (
     Batch,
     Tokens,
@@ -564,7 +564,8 @@ class CausalLM(Model):
     @tracer.start_as_current_span("generate_token")
     def generate_token(
         self, batch: CausalLMBatch
-    ) -> Tuple[List[Generation], Optional[CausalLMBatch]]:
+    ) -> Tuple[List[Generation], Optional[CausalLMBatch], Tuple[int, int]]:
+        start = time.time_ns()
         # slice the attention mask to the correct shape
         attention_mask = batch.attention_mask[:, : -batch.padding_right_offset]
 
@@ -585,6 +586,8 @@ class CausalLM(Model):
             torch.log_softmax(logits[:, -1], -1),
         )
 
+        start_decode = time.time_ns()
+
         # Zipped iterator
         iterator = zip(
             batch.requests,
@@ -731,7 +734,9 @@ class CausalLM(Model):
 
         # We finished all generations in the batch; there is no next batch
         if stopped:
-            return generations, None
+            forward_ns = start_decode - start
+            decode_ns = time.time_ns() - start_decode
+            return generations, None, (forward_ns, decode_ns)
 
         # Slice unused values from prefill
         batch.input_ids = batch.input_ids[:, :1]
@@ -747,4 +752,6 @@ class CausalLM(Model):
         # Update past key values
         batch.past_key_values = past
 
-        return generations, batch
+        forward_ns = start_decode - start
+        decode_ns = time.time_ns() - start_decode
+        return generations, batch, (forward_ns, decode_ns)
diff --git a/server/text_generation_server/models/flash_causal_lm.py b/server/text_generation_server/models/flash_causal_lm.py
index 14d30635..930082cd 100644
--- a/server/text_generation_server/models/flash_causal_lm.py
+++ b/server/text_generation_server/models/flash_causal_lm.py
@@ -1,6 +1,6 @@
 import math
+import time
 import itertools
-from text_generation_server.utils.tokens import batch_top_tokens
 import torch
 import torch.distributed
 
@@ -9,9 +9,10 @@ import numpy as np
 from dataclasses import dataclass
 from opentelemetry import trace
 from transformers import PreTrainedTokenizerBase
-from typing import Optional, Tuple, List, Type, Union, Dict
+from typing import Optional, Tuple, List, Type, Dict
 
 from text_generation_server.models import Model
+from text_generation_server.utils.tokens import batch_top_tokens
 from text_generation_server.utils.speculate import get_speculate
 from text_generation_server.models.types import (
     Batch,
@@ -689,7 +690,7 @@ class FlashCausalLM(Model):
                 self.dtype,
                 self.device,
             )
-            _, batch = self.generate_token(batch)
+            _, batch, _ = self.generate_token(batch)
         except torch.cuda.OutOfMemoryError as e:
             raise RuntimeError(
                 f"Not enough memory to handle {len(batch.input_ids)} prefill tokens. "
@@ -799,7 +800,8 @@ class FlashCausalLM(Model):
     @tracer.start_as_current_span("generate_token")
     def generate_token(
         self, batch: FlashCausalLMBatch
-    ) -> Tuple[List[Generation], Optional[FlashCausalLMBatch]]:
+    ) -> Tuple[List[Generation], Optional[FlashCausalLMBatch], Tuple[int, int]]:
+        start = time.time_ns()
         prefill = batch.cu_seqlen_prefill is not None
         prefill_logprobs = batch.prefill_next_token_indices is not None
 
@@ -941,6 +943,8 @@ class FlashCausalLM(Model):
         # GPU <-> CPU sync
         next_token_logprobs = next_token_logprobs.tolist()
         next_token_ids = next_input_ids.tolist()
+        accepted_ids = accepted_ids.tolist()
+        start_decode = time.time_ns()
 
         # Zipped iterator
         iterator = zip(
@@ -977,7 +981,6 @@ class FlashCausalLM(Model):
             # Append next token to all tokens
             next_token_texts = []
             left = 0
-            before = stopping_criteria.current_tokens
 
             current_stopped = False
             for j in range(index, index + n_accepted_ids):
@@ -1092,7 +1095,7 @@ class FlashCausalLM(Model):
                 generations.append(generation)
 
             # Update values
-            batch.input_lengths[i] = input_length + n_accepted_ids.item()
+            batch.input_lengths[i] = input_length + n_accepted_ids
             if batch.input_lengths[i] > batch.max_seqlen:
                 batch.max_seqlen = batch.input_lengths[i]
             batch.prefix_offsets[i] = prefix_offset
@@ -1102,10 +1105,14 @@ class FlashCausalLM(Model):
         if stopped:
             del batch
             # No need to return a batch if we know that all requests stopped
-            return generations, None
+            forward_ns = start_decode - start
+            decode_ns = time.time_ns() - start_decode
+            return generations, None, (forward_ns, decode_ns)
 
         batch.prefill_cu_outlens = None
         batch.prefill_head_indices = None
         batch.prefill_next_token_indices = None
 
-        return generations, batch
+        forward_ns = start_decode - start
+        decode_ns = time.time_ns() - start_decode
+        return generations, batch, (forward_ns, decode_ns)
diff --git a/server/text_generation_server/models/idefics_causal_lm.py b/server/text_generation_server/models/idefics_causal_lm.py
index 86389ad2..2f28688d 100644
--- a/server/text_generation_server/models/idefics_causal_lm.py
+++ b/server/text_generation_server/models/idefics_causal_lm.py
@@ -1,17 +1,11 @@
 import torch
-import inspect
-import re
-from io import BytesIO
-import base64
-from PIL import Image
-import re
+import time
 
 from dataclasses import dataclass
 from opentelemetry import trace
 from transformers import (
     AutoProcessor,
     AutoTokenizer,
-    AutoModelForCausalLM,
     PreTrainedTokenizerBase,
     ProcessorMixin,
 )
@@ -670,7 +664,8 @@ class IdeficsCausalLM(Model):
     @tracer.start_as_current_span("generate_token")
     def generate_token(
         self, batch: IdeficsCausalLMBatch
-    ) -> Tuple[List[Generation], Optional[IdeficsCausalLMBatch]]:
+    ) -> Tuple[List[Generation], Optional[IdeficsCausalLMBatch], Tuple[int, int]]:
+        start = time.time_ns()
         # slice the attention mask to the correct shape
         attention_mask = batch.attention_mask[:, : -batch.padding_right_offset]
         if batch.input_ids.size(1) == 1:
@@ -699,6 +694,8 @@ class IdeficsCausalLM(Model):
         # Hardcoded remove image tokens
         logits[:, 32000:32001] = torch.finfo(logits.dtype).min
 
+        start_decode = time.time_ns()
+
         # Results
         generations: List[Generation] = []
         stopped = True
@@ -827,7 +824,9 @@ class IdeficsCausalLM(Model):
 
         # We finished all generations in the batch; there is no next batch
         if stopped:
-            return generations, None
+            forward_ns = start_decode - start
+            decode_ns = time.time_ns() - start_decode
+            return generations, None, (forward_ns, decode_ns)
 
         # Slice unused values from prefill
         batch.input_ids = batch.input_ids[:, :1]
@@ -847,4 +846,6 @@ class IdeficsCausalLM(Model):
         batch.past_key_values = past
         batch.image_hidden_states = image_hidden_states
 
-        return generations, batch
+        forward_ns = start_decode - start
+        decode_ns = time.time_ns() - start_decode
+        return generations, batch, (forward_ns, decode_ns)
diff --git a/server/text_generation_server/models/model.py b/server/text_generation_server/models/model.py
index dfb21dcb..cb358672 100644
--- a/server/text_generation_server/models/model.py
+++ b/server/text_generation_server/models/model.py
@@ -65,7 +65,9 @@ class Model(ABC):
         raise NotImplementedError
 
     @abstractmethod
-    def generate_token(self, batch: B) -> Tuple[List[Generation], Optional[B]]:
+    def generate_token(
+        self, batch: B
+    ) -> Tuple[List[Generation], Optional[B], Tuple[int, int]]:
         raise NotImplementedError
 
     def warmup(self, batch: B) -> Optional[int]:
diff --git a/server/text_generation_server/models/seq2seq_lm.py b/server/text_generation_server/models/seq2seq_lm.py
index a85ef58e..f2e4cec6 100644
--- a/server/text_generation_server/models/seq2seq_lm.py
+++ b/server/text_generation_server/models/seq2seq_lm.py
@@ -1,11 +1,12 @@
-from text_generation_server.utils.tokens import batch_top_tokens
 import torch
+import time
 
 from dataclasses import dataclass
 from opentelemetry import trace
 from transformers import AutoTokenizer, AutoModelForSeq2SeqLM, PreTrainedTokenizerBase
 from typing import Optional, Tuple, List, Type, Dict
 
+from text_generation_server.utils.tokens import batch_top_tokens
 from text_generation_server.models import Model
 from text_generation_server.models.types import (
     GeneratedText,
@@ -613,7 +614,8 @@ class Seq2SeqLM(Model):
     @tracer.start_as_current_span("generate_token")
     def generate_token(
         self, batch: Seq2SeqLMBatch
-    ) -> Tuple[List[Generation], Optional[Seq2SeqLMBatch]]:
+    ) -> Tuple[List[Generation], Optional[Seq2SeqLMBatch], Tuple[int, int]]:
+        start = time.time_ns()
         if batch.decoder_attention_mask is not None:
             # slice to the correct shape
             decoder_attention_mask = batch.decoder_attention_mask[
@@ -644,6 +646,8 @@ class Seq2SeqLM(Model):
             torch.log_softmax(logits[:, -1], -1),
         )
 
+        start_decode = time.time_ns()
+
         # Finished requests
         generations: List[Generation] = []
         stopped = True
@@ -788,7 +792,9 @@ class Seq2SeqLM(Model):
 
         # We finished all generations in the batch; there is no next batch
         if stopped:
-            return generations, None
+            forward_ns = start_decode - start
+            decode_ns = time.time_ns() - start_decode
+            return generations, None, (forward_ns, decode_ns)
 
         # We don't need input_ids after the prefill forward
         batch.input_ids = None
@@ -799,4 +805,6 @@ class Seq2SeqLM(Model):
             batch.decoder_attention_mask[:, -batch.padding_right_offset] = 1
         batch.padding_right_offset -= 1
 
-        return generations, batch
+        forward_ns = start_decode - start
+        decode_ns = time.time_ns() - start_decode
+        return generations, batch, (forward_ns, decode_ns)
diff --git a/server/text_generation_server/server.py b/server/text_generation_server/server.py
index 75dba972..a65138c9 100644
--- a/server/text_generation_server/server.py
+++ b/server/text_generation_server/server.py
@@ -1,6 +1,7 @@
 import asyncio
 import os
 import torch
+import time
 
 from grpc import aio
 from loguru import logger
@@ -76,6 +77,7 @@ class TextGenerationService(generate_pb2_grpc.TextGenerationServiceServicer):
         )
 
     async def Prefill(self, request, context):
+        start = time.time_ns()
         if (
             self.model.batch_type == IdeficsCausalLMBatch
         ):  # Hack, i would rather use kwargs in the `from_pb` call
@@ -91,15 +93,19 @@ class TextGenerationService(generate_pb2_grpc.TextGenerationServiceServicer):
                 request.batch, self.model.tokenizer, self.model.dtype, self.model.device
             )
 
-        generations, next_batch = self.model.generate_token(batch)
+        generations, next_batch, timings = self.model.generate_token(batch)
         self.cache.set(next_batch)
 
         return generate_pb2.PrefillResponse(
             generations=[generation.to_pb() for generation in generations],
             batch=next_batch.to_pb() if next_batch else None,
+            forward_ns=timings[0],
+            decode_ns=timings[1],
+            total_ns=time.time_ns() - start,
         )
 
     async def Decode(self, request, context):
+        start = time.time_ns()
         if len(request.batches) == 0:
             raise ValueError("Must provide at least one batch")
 
@@ -114,16 +120,23 @@ class TextGenerationService(generate_pb2_grpc.TextGenerationServiceServicer):
             raise ValueError("All batches are empty")
 
         if len(batches) > 1:
+            start_concat = time.time_ns()
             batch = self.model.batch_type.concatenate(batches)
+            concat_ns = time.time_ns() - start_concat
         else:
             batch = batches[0]
+            concat_ns = None
 
-        generations, next_batch = self.model.generate_token(batch)
+        generations, next_batch, timings = self.model.generate_token(batch)
         self.cache.set(next_batch)
 
         return generate_pb2.DecodeResponse(
             generations=[generation.to_pb() for generation in generations],
             batch=next_batch.to_pb() if next_batch else None,
+            concat_ns=concat_ns,
+            forward_ns=timings[0],
+            decode_ns=timings[1],
+            total_ns=time.time_ns() - start,
         )
 
 
diff --git a/server/text_generation_server/utils/tokens.py b/server/text_generation_server/utils/tokens.py
index 0d208104..ff0556df 100644
--- a/server/text_generation_server/utils/tokens.py
+++ b/server/text_generation_server/utils/tokens.py
@@ -92,7 +92,7 @@ class NextTokenChooser:
 class StopSequenceCriteria:
     def __init__(self, stop_sequence: str):
         stop_sequence = re.escape(stop_sequence)
-        self.regex = re.compile(f".*{stop_sequence}$")
+        self.regex = re.compile(f"{stop_sequence}$")
 
     def __call__(self, output: str) -> bool:
         if self.regex.findall(output):