event_queue.js

var count       = 0,
    s           = null;
    equeue      = [],
    equeue_size = 32;
    flush_timer = null,
    flush_int   = 6, // how often WebKit may fire mouse events
    flush_count = 0;

function inc() {
  count++;
  if(count == 999999) {
    console.log("result:", count, ", elapsed ms:", (new Date())-s);
  }
}

function queue(f) {
  equeue.push(f);
  if(equeue.length > equeue_size) {
    setTimeout(flush(), 0);
  } else if(!flush_timer) {
    flush_timer = setTimeout(flush_current, flush_int);
  }
}

function flush() {
  clearTimeout(flush_timer);
  flush_timer = null;
  var to_flush = equeue;
  equeue = [];
  return function() {
    exec(to_flush);
  };
}

function flush_current() {
  flush_timer = null;
  exec(equeue);
  equeue = [];
}

function exec(xs) {
  for(var i = 0; i < xs.length; i++) {
    xs[i]();
  }
}

function run() {
  s = new Date();
  for(var i = 0; i < 1000000; i++) {
    queue(inc);
  }
  console.log("queued ms elapsed:", (new Date())-s);
}

run();