Reduce unnecessary storage writes.

src/General/Index.coffee

@@ -321,9 +321,10 @@ Index =
     state
 
   saveMode: (mode) ->
-    Conf['Index Mode'] = mode
-    $.set 'Index Mode', mode
-    unless mode is 'catalog'
+    unless Conf['Index Mode'] is mode
+      Conf['Index Mode'] = mode
+      $.set 'Index Mode', mode
+    unless mode is 'catalog' or Conf['Previous Index Mode'] is mode
       Conf['Previous Index Mode'] = mode
       $.set 'Previous Index Mode', mode
 

src/General/lib/databoard.class

@@ -79,7 +79,7 @@ class DataBoard
       for boardID of @data.boards
         for threadID of @data.boards[boardID]
           @ajaxClean boardID, threadID
-    @save()
+    return
 
   ajaxClean: (boardID, threadID) ->
     $.ajax "//a.4cdn.org/#{boardID}/thread/#{threadID}.json",