Javascript engine for loops. You can register and unregister functions and use just a single Interval to fire them all each iteration. Optimization is welcomed. I already tried to replace the interval with a RequestAnimationFrame but the result was not as fast as I expected - in fact slower!!

stripteaser_engine.js

(function($) {   
  // GLOBALS 
	$.STSR_FOCUS_TARGET;
	$.STSR_ENGINE;
	$.STSR_ENGINE_SPEED;
	$.STSR_ENGINE_PROCESSES = [];
	$.STSR_ID = 0;
	
	$.ENGINE = {// initialize values	
		init:function(ops){
			$.STSR_ENGINE_SPEED = ops.speed;		
		},               
		status:'off',
		/*/////////////////////////////////
			StripTeser Engine Methods: 
			stop, start, register, unregister
		/////////////////////////////////*/
		
		// Iteration interval
		run:function(){
			var i = $.STSR_ENGINE_PROCESSES.length;
			while(i--){				
				var fn = $.STSR_ENGINE_PROCESSES[i].process;
				var v	 = $.STSR_ENGINE_PROCESSES[i].values;
				fn(v);				
			}
		},		
		// Stop iteration interval
		stop:function(){
			if(!$.STSR_ENGINE || $.STSR_ENGINE==undefined) return false;
			clearInterval($.STSR_ENGINE);
			$.STSR_ENGINE_PROCESSES = [];
			$.STSR_ENGINE = null;											
			$.STSR_ID = 0;    
			this.status = 'off';
		},	
		// Start iteration interval
		start:function(){
			if($.STSR_ENGINE==null)
			{
				$.STSR_ENGINE = setInterval($.ENGINE.run,$.STSR_ENGINE_SPEED);         
				this.status = 'on';
			}		
		},
		// Register process
		add:function(fn,v){			
			if(!$.STSR_ENGINE_PROCESSES.inArray(fn)){
				$.STSR_ENGINE_PROCESSES.push({'process':fn,'values':v});
			}else{	return null;	}			
			if($.STSR_ENGINE_PROCESSES.length>0) $.ENGINE.start();				
		},
		//Unregister process
		del:function(fn){
			var l = $.STSR_ENGINE_PROCESSES.length;
			var i = 0;		
			for (i; i<l; i++) {
			  if ($.STSR_ENGINE_PROCESSES[i]!=undefined && $.STSR_ENGINE_PROCESSES[i].process == fn)
				{
					$.STSR_ENGINE_PROCESSES.splice(i,1);
				}				
			}		
			if($.STSR_ENGINE_PROCESSES.length<=0) {				
				$.ENGINE.stop();
			}
		},
		die : function(){
			if($.STSR_ENGINE_PROCESSES.length<=0 || !$.ENGINE || $.ENGINE==undefined) return false;
			$.ENGINE.stop();
			$.STSR_ENGINE_PROCESSES = [];
		}
	}
	Array.prototype.inArray = function(needle) {			
		for(var i=0; i < this.length; i++){ 	
			if(this[ i].process === needle)	return true;
		}
		return false;
	}
	Array.prototype.sortOn = function(){
	  var dup = this.slice();
	  if(!arguments.length) return dup.sort();
	  var args = Array.apply(null,arguments);
	  return dup.sort(function(a,b){
	    var props = args.slice();
	    var prop = props.shift();
	    while(a[prop] == b[prop] && props.length) prop = props.shift();
	    return a[prop] == b[prop] ? 0 : a[prop] > b[prop] ? 1 : -1;
	  });
	};
})(jQuery);