Request loadSettings.windowState via IPC messages.

src/atom.coffee

@@ -94,7 +94,14 @@ class Atom extends Model
 
   # Private: Returns the load settings hash associated with the current window.
   @getLoadSettings: ->
-    _.deepClone(@loadSettings ?= JSON.parse(decodeURIComponent(location.search.substr(14))))
+    @loadSettings ?= JSON.parse(decodeURIComponent(location.search.substr(14)))
+    cloned = _.deepClone(@loadSettings)
+    # The loadSettings.windowState could be large, request it only when needed.
+    cloned.__defineGetter__ 'windowState', =>
+      @getCurrentWindow().loadSettings.windowState
+    cloned.__defineSetter__ 'windowState', (value) =>
+      @getCurrentWindow().loadSettings.windowState = value
+    cloned
 
   # Private:
   @getCurrentWindow: ->

src/browser/atom-window.coffee

@@ -55,12 +55,16 @@ class AtomWindow
     process.env['NODE_PATH'] = path.resolve(resourcePath, 'exports')
 
   getUrl: (loadSettingsObj) ->
-    loadSettings = JSON.stringify(loadSettingsObj)
+    # Ignore the windowState when passing loadSettings via URL, since it could
+    # be quite large.
+    loadSettings = _.clone(loadSettingsObj)
+    delete loadSettings['windowState']
+
     url.format
       protocol: 'file'
       pathname: "#{@resourcePath}/static/index.html"
       slashes: true
-      query: {loadSettings}
+      query: {loadSettings: JSON.stringify(loadSettings)}
 
   getInitialPath: ->
     @browserWindow.loadSettings.initialPath