diff --git a/builds/4chan-X.user.js b/builds/4chan-X.user.js
index 0b74da538..0e7fc6af5 100644
--- a/builds/4chan-X.user.js
+++ b/builds/4chan-X.user.js
@@ -2832,10 +2832,14 @@
       return $.event('change', null, Index.selectMode);
     },
     cycleSortType: function() {
-      var i, type, types, _i, _len;
-      types = __slice.call(Index.selectSort.options).filter(function(option) {
-        return !option.disabled;
-      });
+      var i, option, type, types, _i, _len;
+      types = [];
+      i = 0;
+      while (option = Index.selectSort.options[i++]) {
+        if (!option.disabled) {
+          types.push(option);
+        }
+      }
       for (i = _i = 0, _len = types.length; _i < _len; i = ++_i) {
         type = types[i];
         if (type.selected) {
@@ -2846,13 +2850,15 @@
       return $.event('change', null, Index.selectSort);
     },
     catalogSwitch: function() {
-      var hash;
-      if (!Conf['JSON Navigation']) {
-        return;
-      }
-      $.set('Index Mode', 'catalog');
-      hash = window.location.hash;
-      return window.location = './' + hash;
+      return $.get('JSON Navigation', true, function(items) {
+        var hash;
+        if (!items['JSON Navigation']) {
+          return;
+        }
+        $.set('Index Mode', 'catalog');
+        hash = window.location.hash;
+        return window.location = './' + hash;
+      });
     },
     searchTest: function() {
       var hash, match;
@@ -2942,20 +2948,18 @@
         return Index.buildIndex();
       },
       target: function() {
-        var thread, threadID, thumb, _ref;
-        _ref = g.BOARD.threads;
-        for (threadID in _ref) {
-          thread = _ref[threadID];
+        return g.BOARD.threads.forEach(function(thread) {
+          var thumb;
           if (!thread.catalogView) {
-            continue;
+            return;
           }
           thumb = thread.catalogView.nodes.thumb;
           if (Conf['Open threads in a new tab']) {
-            thumb.target = '_blank';
+            return thumb.target = '_blank';
           } else {
-            thumb.removeAttribute('target');
+            return thumb.removeAttribute('target');
           }
-        }
+        });
       },
       replies: function() {
         Index.buildThreads();
@@ -3359,7 +3363,7 @@
       return Main.callbackNodes(Post, posts);
     },
     buildCatalogViews: function() {
-      var catalogThreads, nodes, thread, _i, _j, _len, _len1, _ref, _ref1;
+      var catalogThreads, i, nodes, thread, _i, _len, _ref;
       catalogThreads = [];
       _ref = Index.sortedThreads;
       for (_i = 0, _len = _ref.length; _i < _len; _i++) {
@@ -3370,9 +3374,8 @@
       }
       Main.callbackNodes(CatalogThread, catalogThreads);
       nodes = [];
-      _ref1 = Index.sortedThreads;
-      for (_j = 0, _len1 = _ref1.length; _j < _len1; _j++) {
-        thread = _ref1[_j];
+      i = 0;
+      while (thread = Index.sortedThreads[i++]) {
         nodes.push(thread.catalogView.nodes.root);
       }
       return nodes;
@@ -3393,7 +3396,7 @@
       }
     },
     sort: function() {
-      var sortedThreadIDs, sortedThreads, threadID, _i, _len;
+      var i, sortedThreadIDs, sortedThreads, thread, threadID;
       sortedThreads = [];
       sortedThreadIDs = [];
       ({
@@ -3401,7 +3404,7 @@
           return sortedThreadIDs = Index.liveThreadIDs;
         },
         'lastreply': function() {
-          var data, liveData, _i, _len;
+          var data, i, liveData;
           liveData = __slice.call(Index.liveThreadData).sort(function(a, b) {
             var _ref, _ref1;
             if ('last_replies' in a) {
@@ -3412,8 +3415,8 @@
             }
             return b.no - a.no;
           });
-          for (_i = 0, _len = liveData.length; _i < _len; _i++) {
-            data = liveData[_i];
+          i = 0;
+          while (data = liveData[i++]) {
             sortedThreadIDs.push(data.no);
           }
         },
@@ -3423,33 +3426,37 @@
           });
         },
         'replycount': function() {
-          var data, liveData, _i, _len;
+          var data, i, liveData;
           liveData = __slice.call(Index.liveThreadData).sort(function(a, b) {
             return b.replies - a.replies;
           });
-          for (_i = 0, _len = liveData.length; _i < _len; _i++) {
-            data = liveData[_i];
+          i = 0;
+          while (data = liveData[i++]) {
             sortedThreadIDs.push(data.no);
           }
         },
         'filecount': function() {
-          var data, liveData, _i, _len;
+          var data, i, liveData;
           liveData = __slice.call(Index.liveThreadData).sort(function(a, b) {
             return b.images - a.images;
           });
-          for (_i = 0, _len = liveData.length; _i < _len; _i++) {
-            data = liveData[_i];
+          i = 0;
+          while (data = liveData[i++]) {
             sortedThreadIDs.push(data.no);
           }
         }
       })[Conf['Index Sort']]();
-      for (_i = 0, _len = sortedThreadIDs.length; _i < _len; _i++) {
-        threadID = sortedThreadIDs[_i];
+      i = 0;
+      while (threadID = sortedThreadIDs[i++]) {
         sortedThreads.push(g.BOARD.threads[threadID]);
       }
-      Index.sortedThreads = sortedThreads.filter(function(thread) {
-        return thread.isHidden === Index.showHiddenThreads;
-      });
+      Index.sortedThreads = [];
+      i = 0;
+      while (thread = sortedThreads[i++]) {
+        if (thread.isHidden === Index.showHiddenThreads) {
+          Index.sortedThreads.push(thread);
+        }
+      }
       if (Index.isSearching) {
         Index.sortedThreads = Index.querySearch(Index.searchInput.value) || Index.sortedThreads;
       }
@@ -3553,9 +3560,16 @@
       return Index.search(keywords);
     },
     search: function(keywords) {
-      return Index.sortedThreads.filter(function(thread) {
-        return Index.searchMatch(thread, keywords);
-      });
+      var filtered, i, sortedThreads, thread;
+      filtered = [];
+      i = 0;
+      sortedThreads = Index.sortedThreads;
+      while (thread = sortedThreads[i++]) {
+        if (Index.searchMatch(thread, keywords)) {
+          filtered.push(thread);
+        }
+      }
+      return Index.sortedThreads = filtered;
     },
     searchMatch: function(thread, keywords) {
       var file, info, key, keyword, text, _i, _j, _len, _len1, _ref, _ref1;
diff --git a/builds/crx/script.js b/builds/crx/script.js
index 9d7c2e7f0..fa91a6218 100644
--- a/builds/crx/script.js
+++ b/builds/crx/script.js
@@ -2891,10 +2891,14 @@
       return $.event('change', null, Index.selectMode);
     },
     cycleSortType: function() {
-      var i, type, types, _i, _len;
-      types = __slice.call(Index.selectSort.options).filter(function(option) {
-        return !option.disabled;
-      });
+      var i, option, type, types, _i, _len;
+      types = [];
+      i = 0;
+      while (option = Index.selectSort.options[i++]) {
+        if (!option.disabled) {
+          types.push(option);
+        }
+      }
       for (i = _i = 0, _len = types.length; _i < _len; i = ++_i) {
         type = types[i];
         if (type.selected) {
@@ -2905,13 +2909,15 @@
       return $.event('change', null, Index.selectSort);
     },
     catalogSwitch: function() {
-      var hash;
-      if (!Conf['JSON Navigation']) {
-        return;
-      }
-      $.set('Index Mode', 'catalog');
-      hash = window.location.hash;
-      return window.location = './' + hash;
+      return $.get('JSON Navigation', true, function(items) {
+        var hash;
+        if (!items['JSON Navigation']) {
+          return;
+        }
+        $.set('Index Mode', 'catalog');
+        hash = window.location.hash;
+        return window.location = './' + hash;
+      });
     },
     searchTest: function() {
       var hash, match;
@@ -3001,20 +3007,18 @@
         return Index.buildIndex();
       },
       target: function() {
-        var thread, threadID, thumb, _ref;
-        _ref = g.BOARD.threads;
-        for (threadID in _ref) {
-          thread = _ref[threadID];
+        return g.BOARD.threads.forEach(function(thread) {
+          var thumb;
           if (!thread.catalogView) {
-            continue;
+            return;
           }
           thumb = thread.catalogView.nodes.thumb;
           if (Conf['Open threads in a new tab']) {
-            thumb.target = '_blank';
+            return thumb.target = '_blank';
           } else {
-            thumb.removeAttribute('target');
+            return thumb.removeAttribute('target');
           }
-        }
+        });
       },
       replies: function() {
         Index.buildThreads();
@@ -3418,7 +3422,7 @@
       return Main.callbackNodes(Post, posts);
     },
     buildCatalogViews: function() {
-      var catalogThreads, nodes, thread, _i, _j, _len, _len1, _ref, _ref1;
+      var catalogThreads, i, nodes, thread, _i, _len, _ref;
       catalogThreads = [];
       _ref = Index.sortedThreads;
       for (_i = 0, _len = _ref.length; _i < _len; _i++) {
@@ -3429,9 +3433,8 @@
       }
       Main.callbackNodes(CatalogThread, catalogThreads);
       nodes = [];
-      _ref1 = Index.sortedThreads;
-      for (_j = 0, _len1 = _ref1.length; _j < _len1; _j++) {
-        thread = _ref1[_j];
+      i = 0;
+      while (thread = Index.sortedThreads[i++]) {
         nodes.push(thread.catalogView.nodes.root);
       }
       return nodes;
@@ -3452,7 +3455,7 @@
       }
     },
     sort: function() {
-      var sortedThreadIDs, sortedThreads, threadID, _i, _len;
+      var i, sortedThreadIDs, sortedThreads, thread, threadID;
       sortedThreads = [];
       sortedThreadIDs = [];
       ({
@@ -3460,7 +3463,7 @@
           return sortedThreadIDs = Index.liveThreadIDs;
         },
         'lastreply': function() {
-          var data, liveData, _i, _len;
+          var data, i, liveData;
           liveData = __slice.call(Index.liveThreadData).sort(function(a, b) {
             var _ref, _ref1;
             if ('last_replies' in a) {
@@ -3471,8 +3474,8 @@
             }
             return b.no - a.no;
           });
-          for (_i = 0, _len = liveData.length; _i < _len; _i++) {
-            data = liveData[_i];
+          i = 0;
+          while (data = liveData[i++]) {
             sortedThreadIDs.push(data.no);
           }
         },
@@ -3482,33 +3485,37 @@
           });
         },
         'replycount': function() {
-          var data, liveData, _i, _len;
+          var data, i, liveData;
           liveData = __slice.call(Index.liveThreadData).sort(function(a, b) {
             return b.replies - a.replies;
           });
-          for (_i = 0, _len = liveData.length; _i < _len; _i++) {
-            data = liveData[_i];
+          i = 0;
+          while (data = liveData[i++]) {
             sortedThreadIDs.push(data.no);
           }
         },
         'filecount': function() {
-          var data, liveData, _i, _len;
+          var data, i, liveData;
           liveData = __slice.call(Index.liveThreadData).sort(function(a, b) {
             return b.images - a.images;
           });
-          for (_i = 0, _len = liveData.length; _i < _len; _i++) {
-            data = liveData[_i];
+          i = 0;
+          while (data = liveData[i++]) {
             sortedThreadIDs.push(data.no);
           }
         }
       })[Conf['Index Sort']]();
-      for (_i = 0, _len = sortedThreadIDs.length; _i < _len; _i++) {
-        threadID = sortedThreadIDs[_i];
+      i = 0;
+      while (threadID = sortedThreadIDs[i++]) {
         sortedThreads.push(g.BOARD.threads[threadID]);
       }
-      Index.sortedThreads = sortedThreads.filter(function(thread) {
-        return thread.isHidden === Index.showHiddenThreads;
-      });
+      Index.sortedThreads = [];
+      i = 0;
+      while (thread = sortedThreads[i++]) {
+        if (thread.isHidden === Index.showHiddenThreads) {
+          Index.sortedThreads.push(thread);
+        }
+      }
       if (Index.isSearching) {
         Index.sortedThreads = Index.querySearch(Index.searchInput.value) || Index.sortedThreads;
       }
@@ -3612,9 +3619,16 @@
       return Index.search(keywords);
     },
     search: function(keywords) {
-      return Index.sortedThreads.filter(function(thread) {
-        return Index.searchMatch(thread, keywords);
-      });
+      var filtered, i, sortedThreads, thread;
+      filtered = [];
+      i = 0;
+      sortedThreads = Index.sortedThreads;
+      while (thread = sortedThreads[i++]) {
+        if (Index.searchMatch(thread, keywords)) {
+          filtered.push(thread);
+        }
+      }
+      return Index.sortedThreads = filtered;
     },
     searchMatch: function(thread, keywords) {
       var file, info, key, keyword, text, _i, _j, _len, _len1, _ref, _ref1;
diff --git a/src/General/Index.coffee b/src/General/Index.coffee
index 6a4139e3a..7db9ae027 100644
--- a/src/General/Index.coffee
+++ b/src/General/Index.coffee
@@ -252,17 +252,21 @@ Index =
     $.event 'change', null, Index.selectMode
 
   cycleSortType: ->
-    types = [Index.selectSort.options...].filter (option) -> !option.disabled
+    types = []
+    i = 0
+    while option = Index.selectSort.options[i++]
+      types.push option if !option.disabled
     for type, i in types
       break if type.selected
     types[(i + 1) % types.length].selected = true
     $.event 'change', null, Index.selectSort
 
   catalogSwitch: ->
-    return if !Conf['JSON Navigation']
-    $.set 'Index Mode', 'catalog'
-    {hash} = window.location
-    window.location = './' + hash
+    $.get 'JSON Navigation', true, (items) ->
+      return if !items['JSON Navigation']
+      $.set 'Index Mode', 'catalog'
+      {hash} = window.location
+      window.location = './' + hash
 
   searchTest: ->
     return unless hash = window.location.hash
@@ -331,13 +335,13 @@ Index =
       Index.buildIndex()
 
     target: ->
-      for threadID, thread of g.BOARD.threads when thread.catalogView
+      g.BOARD.threads.forEach (thread) ->
+        return if !thread.catalogView
         {thumb} = thread.catalogView.nodes
         if Conf['Open threads in a new tab']
           thumb.target = '_blank'
         else
           thumb.removeAttribute 'target'
-      return
 
     replies: ->
       Index.buildThreads()
@@ -652,7 +656,9 @@ Index =
       catalogThreads.push new CatalogThread Build.catalogThread(thread), thread
     Main.callbackNodes CatalogThread, catalogThreads
     nodes = []
-    nodes.push thread.catalogView.nodes.root for thread in Index.sortedThreads
+    i = 0
+    while thread = Index.sortedThreads[i++]
+      nodes.push thread.catalogView.nodes.root
     return nodes
 
   sizeCatalogViews: (nodes) ->
@@ -679,21 +685,35 @@ Index =
           [..., a] = a.last_replies if 'last_replies' of a
           [..., b] = b.last_replies if 'last_replies' of b
           b.no - a.no
-        sortedThreadIDs.push data.no for data in liveData
+        i = 0
+        while data = liveData[i++]
+          sortedThreadIDs.push data.no
         return
       'birth': ->
         sortedThreadIDs = [Index.liveThreadIDs...].sort (a, b) -> b - a
       'replycount': ->
         liveData = [Index.liveThreadData...].sort((a, b) -> b.replies - a.replies)
-        sortedThreadIDs.push data.no for data in liveData
+        i = 0
+        while data = liveData[i++]
+          sortedThreadIDs.push data.no
         return
       'filecount': ->
         liveData = [Index.liveThreadData...].sort((a, b) -> b.images - a.images)
-        sortedThreadIDs.push data.no for data in liveData
+        i = 0
+        while data = liveData[i++]
+          sortedThreadIDs.push data.no
         return
     }[Conf['Index Sort']]()
-    sortedThreads.push g.BOARD.threads[threadID] for threadID in sortedThreadIDs
-    Index.sortedThreads = sortedThreads.filter (thread) -> thread.isHidden is Index.showHiddenThreads
+
+    i = 0
+    while threadID = sortedThreadIDs[i++]
+      sortedThreads.push g.BOARD.threads[threadID]
+
+    Index.sortedThreads = []
+    i = 0
+    while thread = sortedThreads[i++]
+      Index.sortedThreads.push thread if thread.isHidden is Index.showHiddenThreads
+
     if Index.isSearching
       Index.sortedThreads = Index.querySearch(Index.searchInput.value) or Index.sortedThreads
     # Sticky threads
@@ -773,8 +793,13 @@ Index =
     Index.search keywords
 
   search: (keywords) ->
-    Index.sortedThreads.filter (thread) ->
-      Index.searchMatch thread, keywords
+    filtered = []
+    i = 0
+    {sortedThreads} = Index
+    while thread = sortedThreads[i++]
+      filtered.push thread if Index.searchMatch thread, keywords
+    Index.sortedThreads = filtered
+    
 
   searchMatch: (thread, keywords) ->
     {info, file} = thread.OP