--- a/net/minecraft/server/level/ChunkMap.java
+++ b/net/minecraft/server/level/ChunkMap.java
@@ -138,7 +_,7 @@
     private final AtomicInteger tickingGenerated = new AtomicInteger();
     private final String storageName;
     private final PlayerMap playerMap = new PlayerMap();
-    public final Int2ObjectMap<ChunkMap.TrackedEntity> entityMap = new Int2ObjectOpenHashMap<>();
+    public final Int2ObjectMap<ChunkMap.TrackedEntity> entityMap = new me.samsuik.sakura.utils.collections.TrackedEntityChunkMap(); // Sakura - optimised tracked entity map
     private final Long2ByteMap chunkTypeCache = new Long2ByteOpenHashMap();
     private final Long2LongMap nextChunkSaveTime = new Long2LongOpenHashMap();
     private final LongSet chunksToEagerlySave = new LongLinkedOpenHashSet();
@@ -1420,7 +_,10 @@
                 double vec3_dz = player.getZ() - this.entity.getZ();
                 // Paper end - remove allocation of Vec3D here
                 int playerViewDistance = ChunkMap.this.getPlayerViewDistance(player);
-                double d = Math.min(this.getEffectiveRange(), playerViewDistance * 16);
+                // Sakura start - entity tracking range modifier
+                double visibleRange = this.getEffectiveRange() * player.trackingRangeModifier;
+                double d = Math.min(visibleRange, playerViewDistance * 16);
+                // Sakura end - entity tracking range modifier
                 double d1 = vec3_dx * vec3_dx + vec3_dz * vec3_dz; // Paper
                 double d2 = d * d;
                 // Paper start - Configurable entity tracking range by Y