[CLOSED] performance problems after upgrade chrome and safari

var _requestAnimFrame = (function() {
  return window.requestAnimationFrame ||
         window.webkitRequestAnimationFrame ||
         window.mozRequestAnimationFrame ||
         window.oRequestAnimationFrame ||
         window.msRequestAnimationFrame ||
         function(callback) {return window.setTimeout(callback,
             1000/cfg_def.max_fps);};
})();