From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Redned <redned235@gmail.com>
Date: Mon, 19 Jun 2023 15:45:53 -0500
Subject: [PATCH] Only tick item frames if players can see it

In the event that an item frame cannot be seen by any players, ticking the item frame every tick is unnecessary. This can be a very hot section of the entity tracker when lots of item frames are present on a server, so this reduces the logic which speeds it up.

diff --git a/src/main/java/net/minecraft/server/level/ServerEntity.java b/src/main/java/net/minecraft/server/level/ServerEntity.java
index 6670e657e08e130f7e0368f418379fd1ece00cdf..acaf9f392660d618472aea7bce967d374eb5d549 100644
--- a/src/main/java/net/minecraft/server/level/ServerEntity.java
+++ b/src/main/java/net/minecraft/server/level/ServerEntity.java
@@ -108,7 +108,7 @@ public class ServerEntity {
 
         Entity entity = this.entity;
 
-        if (entity instanceof ItemFrame) {
+        if (!this.trackedPlayers.isEmpty() && entity instanceof ItemFrame) { // Paper - Only tick item frames if players can see it
             ItemFrame entityitemframe = (ItemFrame) entity;
 
             if (true || this.tickCount % 10 == 0) { // CraftBukkit - Moved below, should always enter this block