From 68150643982ff2b640c1b98cace25992eb5a088a Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 7 Jun 2020 19:25:13 -0400
Subject: [PATCH] Use seed based lookup for Treasure Maps - Fixes lag from
 carto/sunken maps

---
 .../sources/net/minecraft/world/item/MapItem.java.patch  | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/paper-server/patches/sources/net/minecraft/world/item/MapItem.java.patch b/paper-server/patches/sources/net/minecraft/world/item/MapItem.java.patch
index 0227d18101..5374da2aa0 100644
--- a/paper-server/patches/sources/net/minecraft/world/item/MapItem.java.patch
+++ b/paper-server/patches/sources/net/minecraft/world/item/MapItem.java.patch
@@ -11,3 +11,12 @@
                                  int t = 0;
                                  double e = 0.0;
                                  if (world.dimensionType().hasCeiling()) {
+@@ -205,7 +205,7 @@
+ 
+                 for (int n = 0; n < 128; n++) {
+                     for (int o = 0; o < 128; o++) {
+-                        Holder<Biome> holder = world.getBiome(mutableBlockPos.set((l + o) * i, 0, (m + n) * i));
++                        Holder<Biome> holder = world.getUncachedNoiseBiome((l + o) * i, 0, (m + n) * i); // Paper - Perf: Use seed based lookup for treasure maps
+                         bls[n * 128 + o] = holder.is(BiomeTags.WATER_ON_MAP_OUTLINES);
+                     }
+                 }