FView.defer loop with max loop process time

lib/defer.js

@@ -0,0 +1,35 @@
+var DEFER_RUN_THRESHOLD = 2;
+
+/*
+ * Rather than just `setTimeout(f, 0)`, let's assume defer'd functions don't
+ * need to be run "as soon as possible".  We can loop through them once per
+ * frame, and abort the queue if we exceed the given threshold.  Inspired by
+ * famous 0.3.
+ */
+
+var queue = [];
+var timer = typeof performance === 'object' ? performance : Date;
+
+FView.defer = function(func) {
+  queue.push(func);
+};
+
+// avoid garbage collection
+var start, i, len, diff;
+
+var deferRunObj = {
+  onUpdate: function() {
+    start = timer.now();
+    len = queue.length;
+
+    for (i = 0; i < len && timer.now() - start < DEFER_RUN_THRESHOLD; i++)
+      queue[i]();
+
+    queue.splice(0, i);
+    FamousEngine.requestUpdateOnNextTick(deferRunObj);
+  }
+};
+
+FView.ready(function() {
+  FamousEngine.requestUpdate(deferRunObj);
+});

lib/meteor/setimmediate.js

@@ -1,11 +1,8 @@
-FView.ready(function() {
-  var clock = FamousEngine.getClock();
-  // log.debug('Overriding Meteor._setImmediate() to use famous clock');
+// log.debug('Overriding Meteor._setImmediate() to use FView.defer');
 
-  var setImmediate = function (fn) {
-    clock.setTimeout(fn, 0);
-  };
+var setImmediate = function (fn) {
+  FView.defer(fn);
+};
 
-  setImmediate.implementation = 'famous';
-  Meteor._setImmediate = setImmediate;
-});
+setImmediate.implementation = 'famous';
+Meteor._setImmediate = setImmediate;

lib/meteor/timers.js

@@ -35,7 +35,7 @@ FView.ready(function() {
       return clock.clearTimer(x);
     },
     defer: function (f) {
-      Meteor._setImmediate(bindAndCatch("defer callback", f));
+      FView.defer(bindAndCatch("defer callback", f));
     }
   });
 });

package.js

@@ -27,6 +27,7 @@ function common(api) {
     'lib/famous-views.js',
     'lib/utilities.js',
     'lib/meteorFamousView.js',
+    'lib/defer.js',
 
     'lib/wrappers/wrap.js',
     'lib/wrappers/Nodes.js',