timedProcessArray

gistfile1.js

function timedProcessArray(items, process, callback){
     var todo = items.concat(); // Array clone

     setTimeout(function(){
          var start = +new Date();

          do{
               process(todo.shift());
          }while(todo.length > 0 && (+new Date() - start < 50));

          if(todo.length > 0){
               setTimeout(arguments.callee, 25);
          }else{
               callback(items);
          }
     }, 25);
}