perf: NetworkIdentity.Serialize now clears dirty bits while iterating…

…. avoids O(N) ClearALlComponentsDirtyBits call after each Serialize call.

Assets/Mirror/Core/NetworkClient.cs

@@ -1493,9 +1493,6 @@ static void Broadcast()
                                 payload = writer.ToArraySegment()
                             };
                             Send(message);
-
-                            // reset dirty bits so it's not resent next time.
-                            identity.ClearAllComponentsDirtyBits();
                         }
                     }
                 }

Assets/Mirror/Core/NetworkIdentity.cs

@@ -974,6 +974,12 @@ internal void SerializeServer(bool initialState, NetworkWriter ownerWriter, Netw
                             if (ownerDirty)         ownerWriter.WriteBytes(segment.Array, segment.Offset, segment.Count);
                             if (observersDirty) observersWriter.WriteBytes(segment.Array, segment.Offset, segment.Count);
                         }
+
+                        // clear dirty bits after serializing.
+                        // best to do it here while iterating.
+                        // ClearAllComponentsDirtyBits would have to iterate
+                        // everything again otherwise.
+                        comp.ClearAllDirtyBits();
                     }
                 }
             }
@@ -1023,6 +1029,12 @@ internal void SerializeClient(NetworkWriter writer)
                         // serialize into writer.
                         // server always knows initialState, we never need to send it
                         comp.Serialize(writer, false);
+
+                        // clear dirty bits after serializing.
+                        // best to do it here while iterating.
+                        // ClearAllComponentsDirtyBits would have to iterate
+                        // everything again otherwise.
+                        comp.ClearAllDirtyBits();
                     }
                 }
             }
@@ -1112,21 +1124,6 @@ internal NetworkIdentitySerialization GetServerSerializationAtTick(int tick)
                                 lastSerialization.ownerWriter,
                                 lastSerialization.observersWriter);
 
-                // clear dirty bits for the components that we serialized.
-                // previously we did this in NetworkServer.BroadcastToConnection
-                // for every connection, for every entity.
-                // but we only serialize each entity once, right here in this
-                // 'lastSerialization.tick != tick' scope.
-                // so only do it once.
-                //
-                // NOTE: not in Serializell as that should only do one
-                //       thing: serialize data.
-                //
-                // NOTE: this used to be very important to avoid ever growing
-                //       SyncList changes if they had no observers, but we've
-                //       added SyncObject.isRecording since.
-                ClearAllComponentsDirtyBits();
-
                 // set tick
                 lastSerialization.tick = tick;
                 //Debug.Log($"{name} (netId={netId}) serialized for tick={tickTimeStamp}");
@@ -1330,13 +1327,17 @@ internal void Reset()
             isLocalPlayer = false;
         }
 
-        // clear all component's dirty bits no matter what
+        // clear all component's dirty bits no matter what.
+        // when serializing, it's best to clear them while already iterating.
+        // this way we don't need to iterate all components here again.
+        // this should only be used if we need to clear outside of serialization.
         internal void ClearAllComponentsDirtyBits()
         {
             serverOwnerDirtyMask     = 0;
             serverObserversDirtyMask = 0;
             clientDirtyMask          = 0;
 
+            // TODO clear only the dirty ones? fine now without interval.
             foreach (NetworkBehaviour comp in NetworkBehaviours)
             {
                 comp.ClearAllDirtyBits();

Assets/Mirror/Tests/Editor/NetworkIdentitySerializationTests.cs

@@ -346,9 +346,6 @@ public void SerializeServer_ObserversMode_ClientToServer()
             Assert.That(ownerWriter.Position, Is.GreaterThan(0));
             Assert.That(observersWriter.Position, Is.GreaterThan(0));
 
-            // reset dirty bits after serializing
-            identity.ClearAllComponentsDirtyBits();
-
             // delta: should only write for observers
             ++comp.value; // change something
             ownerWriter.Position = 0;