diff --git a/modules/sd_hijack_optimizations.py b/modules/sd_hijack_optimizations.py
index 98123fbf4..02c87f404 100644
--- a/modules/sd_hijack_optimizations.py
+++ b/modules/sd_hijack_optimizations.py
@@ -127,7 +127,7 @@ def check_for_psutil():
 
 invokeAI_mps_available = check_for_psutil()
 
-# -- Taken from https://github.com/invoke-ai/InvokeAI --
+# -- Taken from https://github.com/invoke-ai/InvokeAI and modified --
 if invokeAI_mps_available:
     import psutil
     mem_total_gb = psutil.virtual_memory().total // (1 << 30)
@@ -152,14 +152,16 @@ def einsum_op_slice_1(q, k, v, slice_size):
     return r
 
 def einsum_op_mps_v1(q, k, v):
-    if q.shape[1] <= 4096: # (512x512) max q.shape[1]: 4096
+    if q.shape[0] * q.shape[1] <= 2**16: # (512x512) max q.shape[1]: 4096
         return einsum_op_compvis(q, k, v)
     else:
         slice_size = math.floor(2**30 / (q.shape[0] * q.shape[1]))
+        if slice_size % 4096 == 0:
+            slice_size -= 1
         return einsum_op_slice_1(q, k, v, slice_size)
 
 def einsum_op_mps_v2(q, k, v):
-    if mem_total_gb > 8 and q.shape[1] <= 4096:
+    if mem_total_gb > 8 and q.shape[0] * q.shape[1] <= 2**16:
         return einsum_op_compvis(q, k, v)
     else:
         return einsum_op_slice_0(q, k, v, 1)
@@ -188,7 +190,7 @@ def einsum_op(q, k, v):
         return einsum_op_cuda(q, k, v)
 
     if q.device.type == 'mps':
-        if mem_total_gb >= 32:
+        if mem_total_gb >= 32 and q.shape[0] % 32 != 0 and q.shape[0] * q.shape[1] < 2**18:
             return einsum_op_mps_v1(q, k, v)
         return einsum_op_mps_v2(q, k, v)