Remove un-needed mixin components leaving only FixedToCamera (not sure about this one). Move this.fixedToCamera after the Core.init call which creates the underlying core components required. Add temporary instant return from shiftCanvas in case that was being called and contributing to the slow-down (probably not).

src/tilemap/TilemapLayerGL.js

@@ -219,35 +219,36 @@ Phaser.TilemapLayerGL = function (game, tilemap, index, width, height) {
         this.renderSettings.copyCanvas = Phaser.TilemapLayerGL.ensureSharedCopyCanvas();
     }
 
-    //this.fixedToCamera = true;
-
     var baseTexture = new PIXI.BaseTexture(this.map.tilesets[0].image);
     PIXI.Tilemap.call(this, new PIXI.Texture(baseTexture), this.map.width, this.map.height, this.map.tileWidth, this.map.tileHeight, this.layer);
 
     Phaser.Component.Core.init.call(this, game, 0, 0, null, null);
+
+    // must be called after the Core.init
+    this.fixedToCamera = true;
 };
 
 Phaser.TilemapLayerGL.prototype = Object.create(PIXI.Tilemap.prototype);
 Phaser.TilemapLayerGL.prototype.constructor = Phaser.TilemapLayerGL;
 
 Phaser.Component.Core.install.call(Phaser.TilemapLayerGL.prototype, [
-    'Angle',
-    'Animation',
-    'AutoCull',
-    'Bounds',
-    'BringToTop',
-    'Destroy',
-    'FixedToCamera',
-    'Health',
-    'InCamera',
-    'InputEnabled',
-    'InWorld',
-    'LifeSpan',
-    'LoadTexture',
-    'Overlap',
-    'PhysicsBody',
-    'Reset',
-    'Smoothed'
+    //'Angle',
+    //'Animation',
+    //'AutoCull',
+    //'Bounds',
+    //'BringToTop',
+    //'Destroy',
+    'FixedToCamera'
+    //'Health',
+    //'InCamera',
+    //'InputEnabled',
+    //'InWorld',
+    //'LifeSpan',
+    //'LoadTexture',
+    //'Overlap',
+    //'PhysicsBody',
+    //'Reset',
+    //'Smoothed'
 ]);
 
 Phaser.TilemapLayerGL.prototype.preUpdateCore = Phaser.Component.Core.preUpdate;
@@ -716,6 +717,8 @@ Phaser.TilemapLayerGL.prototype.setScale = function (xScale, yScale) {
 */
 Phaser.TilemapLayerGL.prototype.shiftCanvas = function (context, x, y) {
 
+    return;
+
     var canvas = context.canvas;
     var copyW = canvas.width - Math.abs(x);
     var copyH = canvas.height - Math.abs(y);