It occurs to me that Array.shift() is probably slow.

builds/4chan-X.user.js

@@ -12578,18 +12578,19 @@
       }
     },
     callbackNodesDB: function(klass, nodes, cb) {
-      var callbacks, errors, len, softTask;
+      var callbacks, errors, i, len, softTask;
       errors = null;
       len = 0;
+      i = 0;
       callbacks = klass.callbacks;
       softTask = function() {
         var node;
-        node = nodes.shift();
+        node = nodes[i++];
         callbacks.execute(node);
-        if (!--len && cb) {
+        if (len === i && cb) {
           return cb();
         }
-        if (!(len % 7)) {
+        if (!(i % 7)) {
           return setTimeout(softTask, 0);
         } else {
           return softTask();

builds/crx/script.js

@@ -12552,18 +12552,19 @@
       }
     },
     callbackNodesDB: function(klass, nodes, cb) {
-      var callbacks, errors, len, softTask;
+      var callbacks, errors, i, len, softTask;
       errors = null;
       len = 0;
+      i = 0;
       callbacks = klass.callbacks;
       softTask = function() {
         var node;
-        node = nodes.shift();
+        node = nodes[i++];
         callbacks.execute(node);
-        if (!--len && cb) {
+        if (len === i && cb) {
           return cb();
         }
-        if (!(len % 7)) {
+        if (!(i % 7)) {
           return setTimeout(softTask, 0);
         } else {
           return softTask();

src/General/Main.coffee

@@ -238,14 +238,15 @@ Main =
   callbackNodesDB: (klass, nodes, cb) ->
     errors = null
     len    = 0
+    i = 0
 
     {callbacks} = klass
 
     softTask = ->
-      node = nodes.shift()
+      node = nodes[i++]
       callbacks.execute node
-      return cb() if not --len and cb
+      return cb() if len is i and cb
-      unless len % 7
+      unless i % 7
         setTimeout softTask, 0
       else
         softTask()