diff --git a/check_iperf3.sh b/check_iperf3.sh
index 0ed6eb0..40c9b83 100755
--- a/check_iperf3.sh
+++ b/check_iperf3.sh
@@ -13,39 +13,39 @@ while [[ $# -gt 0 ]]; do
   key="$1"
 
   case $key in
-    --server)
-      SERVER="$2"
-      shift
-      shift
-      ;;
-    --warning)
-      WARNING_LEVEL="$2"
-      shift
-      shift
-      ;;
-    --critical)
-      CRITICAL_LEVEL="$2"
-      shift
-      shift
-      ;;
-    --rsa-public-key)
-      RSA_PUBLIC_KEY="$2"
-      shift
-      shift
-      ;;
-    --username)
-      USERNAME="$2"
-      shift
-      shift
-      ;;
-    --password)
-      PASSWORD="$2"
-      shift
-      shift
-      ;;
-    *)
-      shift
-      ;;
+  --server)
+    SERVER="$2"
+    shift
+    shift
+    ;;
+  --warning)
+    WARNING_LEVEL="$2"
+    shift
+    shift
+    ;;
+  --critical)
+    CRITICAL_LEVEL="$2"
+    shift
+    shift
+    ;;
+  --rsa-public-key)
+    RSA_PUBLIC_KEY="$2"
+    shift
+    shift
+    ;;
+  --username)
+    USERNAME="$2"
+    shift
+    shift
+    ;;
+  --password)
+    PASSWORD="$2"
+    shift
+    shift
+    ;;
+  *)
+    shift
+    ;;
   esac
 done
 
@@ -74,14 +74,17 @@ fi
 # Extract the receiver bitrate
 RECEIVER_BITRATE=$(echo "$OUTPUT" | grep -Eo '[0-9]+(\.[0-9]+)? Mbits/sec' | tail -1 | awk '{print $1}')
 
+# Prepare performance data
+PERFDATA="receiver_bitrate=${RECEIVER_BITRATE}mb;${WARNING_LEVEL};${CRITICAL_LEVEL};0;"
+
 # Check the receiver bitrate against warning and critical levels
-if (( $(echo "$RECEIVER_BITRATE < $CRITICAL_LEVEL" | bc -l) )); then
-  echo "CRITICAL - Receiver Bitrate: $RECEIVER_BITRATE Mbits/sec"
+if (($(echo "$RECEIVER_BITRATE < $CRITICAL_LEVEL" | bc -l))); then
+  echo "CRITICAL - Receiver Bitrate: $RECEIVER_BITRATE Mbits/sec | $PERFDATA"
   exit 2
-elif (( $(echo "$RECEIVER_BITRATE < $WARNING_LEVEL" | bc -l) )); then
-  echo "WARNING - Receiver Bitrate: $RECEIVER_BITRATE Mbits/sec"
+elif (($(echo "$RECEIVER_BITRATE < $WARNING_LEVEL" | bc -l))); then
+  echo "WARNING - Receiver Bitrate: $RECEIVER_BITRATE Mbits/sec | $PERFDATA"
   exit 1
 else
-  echo "OK - Receiver Bitrate: $RECEIVER_BITRATE Mbits/sec"
+  echo "OK - Receiver Bitrate: $RECEIVER_BITRATE Mbits/sec | $PERFDATA"
   exit 0
 fi