Finished tuning the supermodel loading and progress.

app/lib/LevelLoader.coffee

@@ -137,12 +137,18 @@ module.exports = class LevelLoader extends CocoClass
     thangsToLoad = _.uniq( (t.spriteName for t in @world.thangs) )
     nameModelTuples = ([thangType.get('name'), thangType] for thangType in @thangNames.models)
     nameModelMap = _.zipObject nameModelTuples
+    @spriteSheetsToBuild = []
 
     for thangTypeName in thangsToLoad
-      thang = nameModelMap[thangTypeName]
-      thang.fetch()
-      thang = @supermodel.loadModel(thang, 'thang').model
-      @listenToOnce thang, 'sync', @buildSpriteSheetsForThangType
+      thangType = nameModelMap[thangTypeName]
+      thangType.fetch()
+      thangType = @supermodel.loadModel(thangType, 'thang').model
+      res = @supermodel.addSomethingResource "sprite_sheet", 5
+      res.thangType = thangType
+      res.markLoading()
+      @spriteSheetsToBuild.push res
+
+    @buildLoopInterval = setInterval @buildLoop, 5
 
   maybeLoadURL: (url, Model, resourceName) ->
     return if @supermodel.getModel(url)
@@ -150,9 +156,22 @@ module.exports = class LevelLoader extends CocoClass
     @supermodel.loadModel(model, resourceName)
 
   onSupermodelLoaded: ->
+    console.log 'SuperModel for Level loaded in', new Date().getTime() - @t0, 'ms'
     @loadLevelSounds()
     @denormalizeSession()
     app.tracker.updatePlayState(@level, @session) unless @headless
+    
+  buildLoop: =>
+    return if @lastBuilt and new Date().getTime() - @lastBuilt < 10
+    return clearInterval @buildLoopInterval unless @spriteSheetsToBuild.length
+      
+    for spriteSheetResource, i in @spriteSheetsToBuild
+      if spriteSheetResource.thangType.loaded
+        @buildSpriteSheetsForThangType spriteSheetResource.thangType
+        @spriteSheetsToBuild.splice i, 1
+        @lastBuilt = new Date().getTime()
+        spriteSheetResource.markLoaded()
+        return
 
   denormalizeSession: ->
     return if @headless or @sessionDenormalized or @spectateMode
@@ -246,3 +265,7 @@ module.exports = class LevelLoader extends CocoClass
   # everything else sound wise is loaded as needed as worlds are generated
 
   progress: -> @supermodel.progress
+    
+  destroy: ->
+    clearInterval @buildLoopInterval if @buildLoopInterval
+    super()

app/locale/en.coffee

@@ -715,6 +715,7 @@
     top_simulators: "Top Simulators"
     source_document: "Source Document"
     document: "Document" # note to diplomats: not a physical document, a document in MongoDB, ie a record in a database
+    sprite_sheet: "Sprite Sheet"
 
   delta:
     added: "Added"

app/models/SuperModel.coffee

@@ -19,7 +19,6 @@ module.exports = class SuperModel extends Backbone.Model
   loadModel: (model, name, fetchOptions, value=1) ->
     cachedModel = @getModelByURL(model.getURL())
     if cachedModel
-      console.debug 'Model cache hit', cachedModel.get('name') or cachedModel.getURL()
       if cachedModel.loaded
         res = @addModelResource(cachedModel, name, fetchOptions, 0)
         res.markLoaded()
@@ -141,7 +140,7 @@ module.exports = class SuperModel extends Backbone.Model
     @listenToOnce(resource, 'loaded', @onResourceLoaded)
     @listenTo(resource, 'failed', @onResourceFailed)
     @denom += value
-    @updateProgress() if @denom
+    _.defer @updateProgress if @denom
 
   onResourceLoaded: (r) ->
     @num += r.value

app/models/ThangType.coffee

@@ -61,7 +61,9 @@ module.exports = class ThangType extends CocoModel
     return false unless @isFullyLoaded()
     @options = @fillOptions options
     key = @spriteSheetKey(@options)
+    if ss = @spriteSheets[key] then return ss
     return if @building[key]
+    @t0 = new Date().getTime()
     @initBuild(options)
     @addGeneralFrames() unless @options.portraitOnly
     @addPortrait()
@@ -151,9 +153,8 @@ module.exports = class ThangType extends CocoModel
       @builder.buildAsync() unless buildQueue.length > 1
       @builder.on 'complete', @onBuildSpriteSheetComplete, @, true, key
       return true
-    t0 = new Date()
     spriteSheet = @builder.build()
-    console.debug "Built #{@get('name')} in #{new Date() - t0}ms."
+    console.debug "Built #{@get('name')} in #{new Date().getTime() - @t0}ms."
     @spriteSheets[key] = spriteSheet
     delete @building[key]
     spriteSheet

app/views/play/level/thang_avatar_view.coffee

@@ -35,7 +35,7 @@ module.exports = class ThangAvatarView extends View
     context.thang = @thang
     options = @thang?.getSpriteOptions() or {}
     options.async = false
-    context.avatarURL = @thangType.getPortraitSource(options)
+    context.avatarURL = @thangType.getPortraitSource(options) unless @thangType.loading
     context.includeName = @includeName
     context