From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: hayanesuru <hayanesuru@outlook.jp>
Date: Sat, 17 May 2025 19:03:31 +0900
Subject: [PATCH] optimize SynchedEntityData#packDirty


diff --git a/net/minecraft/network/syncher/SynchedEntityData.java b/net/minecraft/network/syncher/SynchedEntityData.java
index 3d90f9f1ac1bd281edf6bb0f93ea821657d5bd2f..546c36d0bc14b8db49245ff162be3dbc4d680da6 100644
--- a/net/minecraft/network/syncher/SynchedEntityData.java
+++ b/net/minecraft/network/syncher/SynchedEntityData.java
@@ -84,7 +84,15 @@ public class SynchedEntityData {
             return null;
         } else {
             this.isDirty = false;
-            List<SynchedEntityData.DataValue<?>> list = new ArrayList<>();
+            // Leaf start
+            int cap = 0;
+            for (SynchedEntityData.DataItem<?> dataItem : this.itemsById) {
+                if (dataItem.isDirty()) {
+                    cap += 1;
+                }
+            }
+            ArrayList<SynchedEntityData.DataValue<?>> list = new ArrayList<>(cap);
+            // Leaf end
 
             for (SynchedEntityData.DataItem<?> dataItem : this.itemsById) {
                 if (dataItem.isDirty()) {