improve performance

src/js/net/minecraft/client/render/Tessellator.js

@@ -7,6 +7,7 @@ window.Tessellator = class {
             transparent: true
         });
 
+        this.index = new THREE.BufferAttribute(new Uint32Array([0, 2, 1, 0, 3, 2]), 1);
     }
 
     bindTexture(texture) {
@@ -49,9 +50,10 @@ window.Tessellator = class {
         geometry.setAttribute('position', new THREE.BufferAttribute(new Float32Array(this.vertices), 3));
         geometry.setAttribute('color', new THREE.BufferAttribute(new Float32Array(this.colors), 3));
         geometry.setAttribute('uv', new THREE.BufferAttribute(new Float32Array(this.uv), 2));
-        geometry.setIndex(new THREE.BufferAttribute(new Uint32Array([0, 2, 1, 0, 3, 2]), 1));
+        geometry.setIndex(this.index);
 
         let mesh = new THREE.Mesh(geometry, this.material);
+        group.matrixAutoUpdate = false;
         group.add(mesh);
     }
 

src/js/net/minecraft/client/render/WorldRenderer.js

@@ -16,6 +16,7 @@ window.WorldRenderer = class {
 
         // Create scene
         this.scene = new THREE.Scene();
+        this.scene.matrixAutoUpdate = false;
 
         // Create web renderer
         this.canvasElement = document.createElement('canvas')

src/js/net/minecraft/client/world/Chunk.js

@@ -6,6 +6,7 @@ window.Chunk = class {
         this.z = z;
 
         this.group = new THREE.Object3D();
+        this.group.matrixAutoUpdate = false;
 
         // Initialize sections
         this.sections = [];

src/js/net/minecraft/client/world/ChunkSection.js

@@ -1,8 +1,6 @@
 window.ChunkSection = class {
 
-    static get SIZE() {
-        return 16;
-    }
+    static SIZE = 16;
 
     constructor(world, x, y, z) {
         this.world = world;
@@ -11,6 +9,7 @@ window.ChunkSection = class {
         this.z = z;
 
         this.group = new THREE.Object3D();
+        this.group.matrixAutoUpdate = false;
         this.dirty = true;
 
         this.blocks = [];

src/js/net/minecraft/client/world/World.js

@@ -4,6 +4,7 @@ window.World = class {
 
     constructor() {
         this.group = new THREE.Object3D();
+        this.group.matrixAutoUpdate = false;
         this.chunks = [];
 
         // Debug world