diff --git a/Assets/Mirror/Runtime/NetworkBehaviour.cs b/Assets/Mirror/Runtime/NetworkBehaviour.cs
index 93d865883..288d107df 100644
--- a/Assets/Mirror/Runtime/NetworkBehaviour.cs
+++ b/Assets/Mirror/Runtime/NetworkBehaviour.cs
@@ -394,7 +394,13 @@ public void ClearAllDirtyBits()
             syncVarDirtyBits = 0L;
 
             // flush all unsynchronized changes in syncobjects
-            m_SyncObjects.ForEach(obj => obj.Flush());
+            // note: don't use List.ForEach here, this is a hot path
+            // List.ForEach: 432b/frame
+            // for: 231b/frame
+            for (int i = 0; i < m_SyncObjects.Count; ++i)
+            {
+                m_SyncObjects[i].Flush();
+            }
         }
 
         internal bool AnySyncObjectDirty()