waterfall much slower than series #621
Description
Hello,
I've put the following in a file called async.html and opened it in Chrome:
<html>
<head>
<script type="text/javascript" src="http://cdnjs.cloudflare.com/ajax/libs/async/0.9.0/async.js"></script>
<script type="text/javascript">
function log(msg) {
console.log((new Date).toISOString(), msg);
}
log('waterfall: start');
async.waterfall([
function(callback) {
log('waterfall: function');
callback();
}
], function(err) {
log('waterfall: finish');
});
log('series: start');
async.series([
function(callback) {
log('series: function');
callback();
}
], function(err) {
log('series: finish');
});
</script>
</head>
</html>The output in the console looks like:
2014-09-11T14:16:41.136Z waterfall: start async.html:6
2014-09-11T14:16:41.141Z series: start async.html:6
2014-09-11T14:16:41.141Z series: function async.html:6
2014-09-11T14:16:41.142Z series: finish async.html:6
2014-09-11T14:16:41.150Z waterfall: function async.html:6
2014-09-11T14:16:41.151Z waterfall: finish async.html:6
Note the delay between waterfall's "start" and "function" (14ms) vs. series' (0ms). In a real-world web app I have the waterfall delay is usually around 600ms. (!)
Is this a known issue, or even an issue at all? is there a reason for such a delay?