From 82f52cd6ec7d61d1ca3ef36ae70d418457cf525c Mon Sep 17 00:00:00 2001
From: Brian Neumann-Fopiano <mypsn1550@gmail.com>
Date: Mon, 28 Sep 2026 11:55:13 -0400
Subject: [PATCH] Skip empty chunk compositions

- Queued and demand compositions of chunks the occupancy index already knows are empty return without loading tiles
---
 .../iris/generation/hydrology/HydrologyTileCache.java     | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/core/src/main/java/art/arcane/iris/generation/hydrology/HydrologyTileCache.java b/core/src/main/java/art/arcane/iris/generation/hydrology/HydrologyTileCache.java
index e37b0c67c..e4c202f5c 100644
--- a/core/src/main/java/art/arcane/iris/generation/hydrology/HydrologyTileCache.java
+++ b/core/src/main/java/art/arcane/iris/generation/hydrology/HydrologyTileCache.java
@@ -933,11 +933,17 @@ public final class HydrologyTileCache implements AutoCloseable {
     }
 
     private ChunkColumns composeChunkColumns(int chunkX, int chunkZ) {
+        if (knownEmpty(chunkX, chunkZ)) {
+            return ChunkColumns.empty(chunkX, chunkZ);
+        }
         ArrayList<HydrologyTileKey> relevantKeys = relevantKeys(chunkX, chunkZ);
         return composeChunkColumns(chunkX, chunkZ, relevantKeys, tiles(relevantKeys));
     }
 
     private ChunkColumns composeChunkColumnsInline(int chunkX, int chunkZ, long epoch) {
+        if (knownEmpty(chunkX, chunkZ)) {
+            return ChunkColumns.empty(chunkX, chunkZ);
+        }
         ArrayList<HydrologyTileKey> keys = relevantKeys(chunkX, chunkZ);
         ArrayList<HydrologyTile> snapshots = new ArrayList<>(keys.size());
         for (HydrologyTileKey key : keys) {
@@ -1209,7 +1215,7 @@ public final class HydrologyTileCache implements AutoCloseable {
     private ChunkCoordinate pollQuery() {
         while (!queriedChunks.isEmpty()) {
             ChunkCoordinate chunk = queriedChunks.getFirst();
-            if (composedChunks.getIfPresent(chunk.packed()) == null) {
+            if (composedChunks.getIfPresent(chunk.packed()) == null && !knownEmpty(chunk.x(), chunk.z())) {
                 return chunk;
             }
             queriedChunks.removeFirst();