SparklyPaperMC/sparklypaper-server/minecraft-patches/features/0003-Skip-MapItem-update-if-the-map-does-not-have-the-Cra.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: MrPowerGamerBR <git@mrpowergamerbr.com>
Date: Fri, 17 Nov 2023 14:22:41 -0300
Subject: [PATCH] Skip "MapItem#update()" if the map does not have the
 CraftMapRenderer present

Optimizes "image in map" maps, without requiring the map to be locked, which some old map plugins may not do

This has the disadvantage that the vanilla map data will never be updated while the CraftMapRenderer is not present, but that's not a huuuge problem for us

diff --git a/net/minecraft/world/item/MapItem.java b/net/minecraft/world/item/MapItem.java
index 8795d54cff569c911e0a535f38a0ec4130f7b4d5..31960e54bf5ed4aa31cd12b60ab0fa263902ce2c 100644
--- a/net/minecraft/world/item/MapItem.java
+++ b/net/minecraft/world/item/MapItem.java
@@ -277,7 +277,7 @@ public class MapItem extends Item {
                     savedData.tickCarriedBy(player, stack);
                 }
 
-                if (!savedData.locked && (isSelected || entity instanceof Player && ((Player)entity).getOffhandItem() == stack)) {
+                if (!savedData.locked && (!level.sparklyPaperConfig.getSkipMapItemDataUpdatesIfMapDoesNotHaveCraftMapRenderer() || savedData.mapView.getRenderers().stream().anyMatch(mapRenderer -> mapRenderer.getClass() == org.bukkit.craftbukkit.map.CraftMapRenderer.class)) && (isSelected || entity instanceof Player && ((Player)entity).getOffhandItem() == stack)) { // SparklyPaper - don't update maps if they don't have the CraftMapRenderer in the render list
                     this.update(level, entity, savedData);
                 }
             }