From 95b4db5169db52777b826f3ea804c42c52c42100 Mon Sep 17 00:00:00 2001
From: "Dylan T." <dktapps@pmmp.io>
Date: Wed, 11 Jun 2025 21:29:03 +0100
Subject: [PATCH] Fix slow SubChunk garbage collection check, closes #6574
 (#6731)

---
 src/world/format/SubChunk.php | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/src/world/format/SubChunk.php b/src/world/format/SubChunk.php
index d8546e7e92..cc66734308 100644
--- a/src/world/format/SubChunk.php
+++ b/src/world/format/SubChunk.php
@@ -134,11 +134,8 @@ class SubChunk{
 		foreach($this->blockLayers as $layer){
 			$layer->collectGarbage();
 
-			foreach($layer->getPalette() as $p){
-				if($p !== $this->emptyBlockId){
-					$cleanedLayers[] = $layer;
-					continue 2;
-				}
+			if($layer->getBitsPerBlock() !== 0 || $layer->get(0, 0, 0) !== $this->emptyBlockId){
+				$cleanedLayers[] = $layer;
 			}
 		}
 		$this->blockLayers = $cleanedLayers;