Got rid of potentially unnecessary (and definitely slow) SpriteSheetBuilder _.cloneDeep. Watch out.

app/lib/LevelLoader.coffee

@@ -99,6 +99,8 @@ module.exports = class LevelLoader extends CocoClass
   onSupermodelError: ->
 
   onSupermodelLoadedOne: (e) ->
+    #if e.model instanceof ThangType
+    #  console.log "LevelLoader loaded ThangType", e.model.get('name'), "so we should figure out how to build it."
     @update()
 
   # Things to do when either the Session or Supermodel load
@@ -171,10 +173,12 @@ module.exports = class LevelLoader extends CocoClass
     building = thangType.buildSpriteSheet options
     return unless building
     console.log 'Building:', thangType.get('name'), options
+    t0 = new Date()
     @spriteSheetsToBuild += 1
     thangType.once 'build-complete', =>
       @spriteSheetsBuilt += 1
       @notifyProgress()
+      console.log "Built", thangType.get('name'), 'after', ((new Date()) - t0), 'ms'
 
   # Initial Sound Loading
 

app/lib/sprites/SpriteBuilder.coffee

@@ -3,7 +3,7 @@
 module.exports = class SpriteBuilder
   constructor: (@thangType, @options) ->
     @options ?= {}
-    raw = _.cloneDeep(@thangType.get('raw'))
+    raw = @thangType.get('raw')
     @shapeStore = raw.shapes
     @containerStore = raw.containers
     @animationStore = raw.animations