diff --git a/app/core/Tracker.coffee b/app/core/Tracker.coffee
index 4294bc6ce..9e07f41d9 100644
--- a/app/core/Tracker.coffee
+++ b/app/core/Tracker.coffee
@@ -100,7 +100,7 @@ module.exports = class Tracker
         eventObject["user"] = me.id
         dataToSend = JSON.stringify eventObject
         # console.log dataToSend if debugAnalytics
-        $.post("http://analytics.codecombat.com/analytics", dataToSend).fail ->
+        $.post("#{window.location.protocol or 'http:'}//analytics.codecombat.com/analytics", dataToSend).fail ->
           console.error "Analytics post failed!"
       else
         request = @supermodel.addRequestResource 'log_event', {
diff --git a/app/core/storage.coffee b/app/core/storage.coffee
index 21e8d59a9..f31e8b300 100644
--- a/app/core/storage.coffee
+++ b/app/core/storage.coffee
@@ -1,4 +1,6 @@
-module.exports.load = (key) ->
+# Pass false for fromCache to fetch keys that have been stored outside of lscache.
+module.exports.load = (key, fromCache=true) ->
+  return lscache.get key if fromCache
   s = localStorage.getItem(key)
   return null unless s
   try
@@ -8,8 +10,17 @@ module.exports.load = (key) ->
     console.warn('error loading from storage', key)
     return null
 
-module.exports.save = (key, value) ->
-  s = JSON.stringify(value)
-  localStorage.setItem(key, s)
+# Pass 0 for expirationInMinutes to persist it as long as possible outside of lscache expiration.
+module.exports.save = (key, value, expirationInMinutes) ->
+  expirationInMinutes ?= 7 * 24 * 60
+  if expirationInMinutes
+    lscache.set key, value, expirationInMinutes
+  else
+    localStorage.setItem key, JSON.stringify(value)
 
-module.exports.remove = (key) -> localStorage.removeItem key
+# Pass false for fromCache to remove keys that have been stored outside of lscache.
+module.exports.remove = (key, fromCache=true) ->
+  if fromCache
+    lscache.remove key
+  else
+    localStorage.removeItem key
diff --git a/app/lib/world/world.coffee b/app/lib/world/world.coffee
index 37d304f5d..18e175f72 100644
--- a/app/lib/world/world.coffee
+++ b/app/lib/world/world.coffee
@@ -70,9 +70,9 @@ module.exports = class World
   setThang: (thang) ->
     thang.stateChanged = true
     for old, i in @thangs
-      console.error 'world trying to set', thang, 'over', old unless old? and thang?
       if old.id is thang.id
         @thangs[i] = thang
+        break
     @thangMap[thang.id] = thang
 
   thangDialogueSounds: (startFrame=0) ->
@@ -102,7 +102,9 @@ module.exports = class World
     if @realTime and not @countdownFinished
       @realTimeSpeedFactor = 1
       unless @showsCountdown
-        if @levelID in ['village-guard', 'thornbush-farm', 'back-to-back', 'ogre-encampment', 'woodland-cleaver', 'shield-rush', 'peasant-protection', 'munchkin-swarm', 'munchkin-harvest', 'swift-dagger', 'shrapnel', 'arcane-ally', 'touch-of-death', 'bonemender']
+        if @levelID in ['woodland-cleaver', 'village-guard', 'shield-rush']
+          @realTimeSpeedFactor = 2
+        else if @levelID in ['thornbush-farm', 'back-to-back', 'ogre-encampment', 'peasant-protection', 'munchkin-swarm', 'munchkin-harvest', 'swift-dagger', 'shrapnel', 'arcane-ally', 'touch-of-death', 'bonemender']
           @realTimeSpeedFactor = 3
       if @showsCountdown
         return setTimeout @finishCountdown(continueLaterFn), REAL_TIME_COUNTDOWN_DELAY
diff --git a/app/locale/en.coffee b/app/locale/en.coffee
index 5222b8a3d..3a9d6dea1 100644
--- a/app/locale/en.coffee
+++ b/app/locale/en.coffee
@@ -529,8 +529,6 @@
     volume_label: "Volume"
     music_label: "Music"
     music_description: "Turn background music on/off."
-    autorun_label: "Autorun"
-    autorun_description: "Control automatic code execution."
     editor_config: "Editor Config"
     editor_config_title: "Editor Configuration"
     editor_config_level_language_label: "Language for This Level"
diff --git a/app/schemas/models/user.coffee b/app/schemas/models/user.coffee
index 111ddab62..df9203abc 100644
--- a/app/schemas/models/user.coffee
+++ b/app/schemas/models/user.coffee
@@ -63,10 +63,10 @@ _.extend UserSchema.properties,
   githubID: {type: 'integer', title: 'GitHub ID'}
   gplusID: c.shortString({title: 'G+ ID'})
 
-  wizardColor1: c.pct({title: 'Wizard Clothes Color'})
+  wizardColor1: c.pct({title: 'Wizard Clothes Color'})  # No longer used
   volume: c.pct({title: 'Volume'})
   music: { type: 'boolean' }
-  autocastDelay: { type: 'integer' }
+  autocastDelay: { type: 'integer' }  # No longer used
   lastLevel: { type: 'string' }
   heroConfig: c.HeroConfigSchema
 
diff --git a/app/templates/base.jade b/app/templates/base.jade
index 003471b53..92df03f01 100644
--- a/app/templates/base.jade
+++ b/app/templates/base.jade
@@ -73,7 +73,7 @@ block footer
           .fb-like(data-href="https://www.facebook.com/codecombat", data-send="false", data-layout="button_count", data-width="350", data-show-faces="true", data-ref="coco_footer_#{fbRef}")
           if !isIE
             a.twitter-follow-button(href="https://twitter.com/CodeCombat", data-show-count="true", data-show-screen-name="false", data-dnt="true", data-align="right", data-i18n="nav.twitter_follow") Follow
-            iframe.github-star-button(src="http://ghbtns.com/github-btn.html?user=codecombat&repo=codecombat&type=watch&count=true", allowtransparency="true", frameborder="0", scrolling="0", width="110", height="20")
+            iframe.github-star-button(src="https://ghbtns.com/github-btn.html?user=codecombat&repo=codecombat&type=watch&count=true", allowtransparency="true", frameborder="0", scrolling="0", width="110", height="20")
     
     #footer-credits
       span 
diff --git a/app/templates/play/level/modal/victory.jade b/app/templates/play/level/modal/victory.jade
index 49a6b896f..effaad52c 100644
--- a/app/templates/play/level/modal/victory.jade
+++ b/app/templates/play/level/modal/victory.jade
@@ -39,4 +39,4 @@ block modal-footer-content
     .g-plusone(data-href="http://codecombat.com", data-size="medium")
     .fb-like(data-href="https://www.facebook.com/codecombat", data-send="false", data-layout="button_count", data-width="350", data-show-faces="true", data-ref="coco_victory_#{fbRef}")
     a.twitter-follow-button(href="https://twitter.com/CodeCombat", data-show-count="true", data-show-screen-name="false", data-dnt="true", data-align="right", data-i18n="nav.twitter_follow") Follow
-    iframe.github-star-button(src="http://ghbtns.com/github-btn.html?user=codecombat&repo=codecombat&type=watch&count=true", allowtransparency="true", frameborder="0", scrolling="0", width="110", height="20")
+    iframe.github-star-button(src="https://ghbtns.com/github-btn.html?user=codecombat&repo=codecombat&type=watch&count=true", allowtransparency="true", frameborder="0", scrolling="0", width="110", height="20")
diff --git a/app/templates/play/menu/game-menu-modal.jade b/app/templates/play/menu/game-menu-modal.jade
index 689c41b53..ed7beae05 100644
--- a/app/templates/play/menu/game-menu-modal.jade
+++ b/app/templates/play/menu/game-menu-modal.jade
@@ -6,10 +6,11 @@
       span.glyphicon.glyphicon-remove
 
     ul#game-menu-nav.nav.nav-pills.nav-stacked
-      li
-        a#change-hero-tab
-          span.glyphicon.glyphicon-user
-          span(data-i18n='[title]game_menu.choose_hero_caption;play.change_hero')
+      if showsChooseHero
+        li
+          a#change-hero-tab
+            span.glyphicon.glyphicon-user
+            span(data-i18n='[title]game_menu.choose_hero_caption;play.change_hero')
 
       for submenu, index in submenus
         li(class=submenu === showTab ? "active" : "")
diff --git a/app/templates/play/menu/options-view.jade b/app/templates/play/menu/options-view.jade
index 5f43a07a8..451d960df 100644
--- a/app/templates/play/menu/options-view.jade
+++ b/app/templates/play/menu/options-view.jade
@@ -22,16 +22,6 @@
       span(data-i18n="options.music_label") Music
     span.help-block(data-i18n="options.music_description") Turn background music on/off.
 
-  .form-group.select-group
-    label.control-label(for="option-autorun-delay", data-i18n="options.autorun_label") Autorun
-    select#option-autorun-delay.form-control(name="autorunDelay")
-      option(value=1000, selected=(autorunDelay === 1000), data-i18n="common.delay_1_sec") 1 second
-      option(value=3000, selected=(autorunDelay === 3000), data-i18n="common.delay_3_sec") 3 seconds
-      option(value=5000, selected=(autorunDelay === 5000), data-i18n="common.delay_5_sec") 5 seconds
-      option(value=90019001, selected=(autorunDelay === 90019001), data-i18n="common.manual") Manual
-    span.help-block(data-i18n="options.autorun_description") Control automatic code execution.
-  
-
   img.hr(src="/images/pages/play/modal/hr.png", draggable="false")
 
   h3(data-i18n="options.editor_config_title") Editor Configuration
diff --git a/app/views/HomeView.coffee b/app/views/HomeView.coffee
index ac14ba60c..718144ce3 100644
--- a/app/views/HomeView.coffee
+++ b/app/views/HomeView.coffee
@@ -51,5 +51,5 @@ module.exports = class HomeView extends RootView
       me.set 'hourOfCode', true
       me.patch()
     # We may also insert the tracking pixel for everyone on the CampaignView so as to count directly-linked visitors.
-    $('body').append($('<img src="http://code.org/api/hour/begin_codecombat.png" style="visibility: hidden;">'))
+    $('body').append($('<img src="https://code.org/api/hour/begin_codecombat.png" style="visibility: hidden;">'))
     application.tracker?.trackEvent 'Hour of Code Begin'
diff --git a/app/views/ladder/LadderPlayModal.coffee b/app/views/ladder/LadderPlayModal.coffee
index 96ba9937a..d0c14ba17 100644
--- a/app/views/ladder/LadderPlayModal.coffee
+++ b/app/views/ladder/LadderPlayModal.coffee
@@ -37,6 +37,9 @@ module.exports = class LadderPlayModal extends ModalView
     aceConfig.language = @$el.find('#tome-language').val()
     me.set 'aceConfig', aceConfig
     me.patch()
+    if @session
+      @session.set 'codeLanguage', aceConfig.language
+      @session.patch()
 
   # PART 1: Load challengers from the db unless some are in the matches
   startLoadingChallengersMaybe: ->
@@ -88,6 +91,7 @@ module.exports = class LadderPlayModal extends ModalView
     ctx.teamID = @team
     ctx.otherTeamID = @otherTeam
     ctx.tutorialLevelExists = @tutorialLevelExists
+    ctx.language = @session?.get('codeLanguage') ? me.get('aceConfig')?.language ? 'python'
     ctx.languages = [
       {id: 'python', name: 'Python'}
       {id: 'javascript', name: 'JavaScript'}
diff --git a/app/views/play/CampaignView.coffee b/app/views/play/CampaignView.coffee
index f8b981dd7..5797f11a1 100644
--- a/app/views/play/CampaignView.coffee
+++ b/app/views/play/CampaignView.coffee
@@ -108,7 +108,7 @@ module.exports = class CampaignView extends RootView
     # If it's a new player who didn't appear to come from Hour of Code, we register her here without setting the hourOfCode property.
     elapsed = (new Date() - new Date(me.get('dateCreated')))
     if not trackedHourOfCode and not me.get('hourOfCode') and elapsed < 5 * 60 * 1000
-      $('body').append($('<img src="http://code.org/api/hour/begin_codecombat.png" style="visibility: hidden;">'))
+      $('body').append($('<img src="https://code.org/api/hour/begin_codecombat.png" style="visibility: hidden;">'))
       trackedHourOfCode = true
 
     @requiresSubscription = not me.isPremium()
diff --git a/app/views/play/level/PlayLevelView.coffee b/app/views/play/level/PlayLevelView.coffee
index f4e4633d2..ca263aaf1 100644
--- a/app/views/play/level/PlayLevelView.coffee
+++ b/app/views/play/level/PlayLevelView.coffee
@@ -352,6 +352,7 @@ module.exports = class PlayLevelView extends RootView
       @realTimeMultiplayerContinueGame @options.realTimeMultiplayerSessionID
     # TODO: Is it possible to create a Mongoose ObjectId for 'ls', instead of the string returned from get()?
     application.tracker?.trackEvent 'Started Level', category:'Play Level', levelID: @levelID, ls: @session?.get('_id') unless @observing
+    $(window).trigger 'resize'
 
   playAmbientSound: ->
     return if @destroyed
diff --git a/app/views/play/level/tome/CastButtonView.coffee b/app/views/play/level/tome/CastButtonView.coffee
index 64b1324a8..6ad76861b 100644
--- a/app/views/play/level/tome/CastButtonView.coffee
+++ b/app/views/play/level/tome/CastButtonView.coffee
@@ -47,10 +47,7 @@ module.exports = class CastButtonView extends CocoView
   afterRender: ->
     super()
     @castButton = $('.cast-button', @$el)
-    @castOptions = $('.autocast-delays', @$el)
-    #delay = me.get('autocastDelay')  # No more autocast
-    delay = 90019001
-    @setAutocastDelay delay
+    spell.view?.createOnCodeChangeHandlers() for spellKey, spell of @spells
     if @options.level.get('hidesSubmitUntilRun') or @options.level.get('hidesRealTimePlayback')
       @$el.find('.submit-button').hide()  # Hide Submit for the first few until they run it once.
     if @options.session.get('state')?.complete and @options.level.get 'hidesRealTimePlayback'
@@ -150,17 +147,6 @@ module.exports = class CastButtonView extends CocoView
       waitTime = moment().add(timeUntilResubmit, 'ms').fromNow()
       submitAgainLabel.text waitTime
 
-  setAutocastDelay: (delay) ->
-    #console.log 'Set autocast delay to', delay
-    return unless delay
-    delay = 90019001  # No more autocast
-    @autocastDelay = delay = parseInt delay
-    me.set('autocastDelay', delay)
-    me.patch()
-    spell.view?.setAutocastDelay delay for spellKey, spell of @spells
-    @castOptions.find('a').each ->
-      $(@).toggleClass('selected', parseInt($(@).attr('data-delay')) is delay)
-
   onJoinedRealTimeMultiplayerGame: (e) ->
     @inRealTimeMultiplayerSession = true
 
diff --git a/app/views/play/level/tome/SpellView.coffee b/app/views/play/level/tome/SpellView.coffee
index 55cc20947..5d13a8094 100644
--- a/app/views/play/level/tome/SpellView.coffee
+++ b/app/views/play/level/tome/SpellView.coffee
@@ -76,6 +76,7 @@ module.exports = class SpellView extends CocoView
     @createACE()
     @createACEShortcuts()
     @fillACE()
+    @createOnCodeChangeHandlers()
     @lockDefaultCode()
     if @session.get('multiplayer')
       @createFirepad()
@@ -613,11 +614,7 @@ module.exports = class SpellView extends CocoView
     Backbone.Mediator.publish 'tome:spell-loaded', spell: @spell
     @updateLines()
 
-  recompileIfNeeded: =>
-    @recompile() if @recompileNeeded
-
   recompile: (cast=true, realTime=false) ->
-    @setRecompileNeeded false
     hasChanged = @spell.source isnt @getSource()
     if hasChanged
       @spell.transpile @getSource()
@@ -640,17 +637,9 @@ module.exports = class SpellView extends CocoView
     catch error
       console.warn 'Error resizing ACE after an update:', error
 
-  # Called from CastButtonView initially and whenever the delay is changed
-  setAutocastDelay: (@autocastDelay) ->
-    @createOnCodeChangeHandlers()
-
   createOnCodeChangeHandlers: ->
     @aceDoc.removeListener 'change', @onCodeChangeMetaHandler if @onCodeChangeMetaHandler
-    autocastDelay = @autocastDelay ? 3000
-    onSignificantChange = [
-      _.debounce @setRecompileNeeded, autocastDelay - 100
-      @currentAutocastHandler = _.debounce @recompileIfNeeded, autocastDelay
-    ]
+    onSignificantChange = []
     onAnyChange = [
       _.debounce @updateAether, 500
       _.debounce @notifyEditingEnded, 1000
@@ -671,10 +660,7 @@ module.exports = class SpellView extends CocoView
           callback() for callback in onAnyChange  # Then these
     @aceDoc.on 'change', @onCodeChangeMetaHandler
 
-  setRecompileNeeded: (@recompileNeeded) =>
-
-  onCursorActivity: =>
-    @currentAutocastHandler?()
+  onCursorActivity: =>  # Used to refresh autocast delay; doesn't do anything at the moment.
 
   # Design for a simpler system?
   # * Keep Aether linting, debounced, on any significant change
@@ -801,7 +787,7 @@ module.exports = class SpellView extends CocoView
     @userCodeProblem.save()
     null
 
-  # Autocast:
+  # Autocast (preload the world in the background):
   # Goes immediately if the code is a) changed and b) complete/valid and c) the cursor is at beginning or end of a line
   # We originally thought it would:
   # - Go after specified delay if a) and b) but not c)
@@ -815,12 +801,9 @@ module.exports = class SpellView extends CocoView
     endOfLine = cursorPosition.column >= currentLine.length  # just typed a semicolon or brace, for example
     beginningOfLine = not currentLine.substr(0, cursorPosition.column).trim().length  # uncommenting code, for example
     incompleteThis = /^(s|se|sel|self|t|th|thi|this)$/.test currentLine.trim()
-    # console.log "finished=#{valid and (endOfLine or beginningOfLine) and not incompleteThis}", valid, endOfLine, beginningOfLine, incompleteThis, cursorPosition, currentLine.length, aether, new Date() - 0, currentLine
+    #console.log "finished=#{valid and (endOfLine or beginningOfLine) and not incompleteThis}", valid, endOfLine, beginningOfLine, incompleteThis, cursorPosition, currentLine.length, aether, new Date() - 0, currentLine
     if valid and (endOfLine or beginningOfLine) and not incompleteThis
-      if @autocastDelay > 60000
-        @preload()
-      else
-        @recompile()
+      @preload()
 
   singleLineCommentRegex: ->
     if @_singleLineCommentRegex
@@ -836,7 +819,10 @@ module.exports = class SpellView extends CocoView
 
   preload: ->
     # Send this code over to the God for preloading, but don't change the cast state.
-    return if @spell.source.indexOf 'while'  # If they're working with while-loops, it's more likely to be an incomplete infinite loop, so don't preload.
+    #console.log 'preload?', @spell.source.indexOf('while'), @spell.source.length, @spellThang?.castAether?.metrics?.statementsExecuted
+    return if @spell.source.indexOf('while') isnt -1  # If they're working with while-loops, it's more likely to be an incomplete infinite loop, so don't preload.
+    return if @spell.source.length > 500  # Only preload on really short methods
+    return if @spellThang?.castAether?.metrics?.statementsExecuted > 2000  # Don't preload if they are running significant amounts of user code
     oldSource = @spell.source
     oldSpellThangAethers = {}
     for thangID, spellThang of @spell.thangs
diff --git a/app/views/play/level/tome/TomeView.coffee b/app/views/play/level/tome/TomeView.coffee
index cd08ce075..eaab9776d 100644
--- a/app/views/play/level/tome/TomeView.coffee
+++ b/app/views/play/level/tome/TomeView.coffee
@@ -1,7 +1,7 @@
 # There's one TomeView per Level. It has:
 # - a CastButtonView, which has
 #   - a cast button
-#   - an autocast settings options button
+#   - a submit/done button
 # - for each spell (programmableMethod):
 #   - a Spell, which has
 #     - a list of Thangs that share that Spell, with one aether per Thang per Spell
diff --git a/app/views/play/menu/GameMenuModal.coffee b/app/views/play/menu/GameMenuModal.coffee
index 9dad94e47..7e5c3aac2 100644
--- a/app/views/play/menu/GameMenuModal.coffee
+++ b/app/views/play/menu/GameMenuModal.coffee
@@ -43,6 +43,7 @@ module.exports = class GameMenuModal extends ModalView
       'guide': 'list'
       'save-load': 'floppy-disk'
       'multiplayer': 'globe'
+    context.showsChooseHero = @options.levelID not in ['zero-sum']
     context
 
   afterRender: ->
diff --git a/app/views/play/menu/OptionsView.coffee b/app/views/play/menu/OptionsView.coffee
index 8b76b4a1e..205057065 100644
--- a/app/views/play/menu/OptionsView.coffee
+++ b/app/views/play/menu/OptionsView.coffee
@@ -20,7 +20,6 @@ module.exports = class OptionsView extends CocoView
 
   events:
     'change #option-music': 'updateMusic'
-    'change #option-autorun-delay': 'updateAutorun'
     'change #option-key-bindings': 'updateInvisibles'
     'change #option-key-bindings': 'updateKeyBindings'
     'change #option-indent-guides': 'updateIndentGuides'
@@ -44,7 +43,6 @@ module.exports = class OptionsView extends CocoView
     @aceConfig = _.defaults @aceConfig, @defaultConfig
     c.aceConfig = @aceConfig
     c.music = me.get('music', true)
-    c.autorunDelay = me.get('autocastDelay') ? 5000
     c
 
   afterRender: ->
@@ -80,9 +78,6 @@ module.exports = class OptionsView extends CocoView
   updateMusic: ->
     me.set 'music', @$el.find('#option-music').prop('checked')
 
-  updateAutorun: ->
-    me.set 'autocastDelay', parseInt(@$el.find('#option-autorun-delay').val())
-
   updateInvisibles: ->
     @aceConfig.invisibles = @$el.find('#option-invisibles').prop('checked')
 
diff --git a/bower.json b/bower.json
index ea8592d3f..484277bcb 100644
--- a/bower.json
+++ b/bower.json
@@ -47,7 +47,8 @@
     "modernizr": "~2.8.3",
     "backfire": "~0.3.0",
     "fastclick": "~1.0.3",
-    "three.js": "*"
+    "three.js": "*",
+    "lscache": "~1.0.5"
   },
   "overrides": {
     "backbone": {