diff --git a/Assets/Mirror/Components/InterestManagement/SpatialHashing/SpatialHashingInterestManagement.cs b/Assets/Mirror/Components/InterestManagement/SpatialHashing/SpatialHashingInterestManagement.cs
index a2f5f1b58..f204a8d2c 100644
--- a/Assets/Mirror/Components/InterestManagement/SpatialHashing/SpatialHashingInterestManagement.cs
+++ b/Assets/Mirror/Components/InterestManagement/SpatialHashing/SpatialHashingInterestManagement.cs
@@ -113,6 +113,8 @@ internal void Update()
             }
         }
 
+// OnGUI allocates even if it does nothing. avoid in release.
+#if UNITY_EDITOR || DEVELOPMENT_BUILD
         // slider from dotsnet. it's nice to play around with in the benchmark
         // demo.
         void OnGUI()
@@ -132,5 +134,6 @@ void OnGUI()
             GUILayout.EndHorizontal();
             GUILayout.EndArea();
         }
+#endif
     }
 }
diff --git a/Assets/Mirror/Runtime/Transport/KCP/MirrorTransport/KcpTransport.cs b/Assets/Mirror/Runtime/Transport/KCP/MirrorTransport/KcpTransport.cs
index 354db3569..19e725110 100644
--- a/Assets/Mirror/Runtime/Transport/KCP/MirrorTransport/KcpTransport.cs
+++ b/Assets/Mirror/Runtime/Transport/KCP/MirrorTransport/KcpTransport.cs
@@ -273,6 +273,8 @@ public static string PrettyBytes(long bytes)
             return $"{(bytes / (1024f * 1024f * 1024f)):F2} GB";
         }
 
+// OnGUI allocates even if it does nothing. avoid in release.
+#if UNITY_EDITOR || DEVELOPMENT_BUILD
         void OnGUI()
         {
             if (!statisticsGUI) return;
@@ -308,6 +310,7 @@ void OnGUI()
 
             GUILayout.EndArea();
         }
+#endif
 
         void OnLogStatistics()
         {