analyzing performance of javascript on mobile

Question

Is there any possibility of analyzing performance of javascript on mobile. Like I have a situation where say a list is rendered quite slowly on mobile (like 3-4 minutes).

Initially i thought its because of the data model and kind of query i am using is causing the delay, but when i took database traces all the query execution is really fast.

I also got hold of n/w trace of attached device (which is simulator in my case) and could see all the data being buffered in under 3 secs. So the only culprit what i anticipate is the JS running behind to render all the data. But i dont know how to trace or do performance analysis of JS on mobile. Any idea??

score 1 · Accepted Answer · 2012-03-23 04:17:35Z

I'm not sure if this is what you're looking for, (your question somewhat confuses me) but here's how to test how long a piece of code takes in JavaScript:

var start = new Date().getTime(); //milliseconds // your section of code // ... var elapsed = new Date().getTime() - start;

You could do that to test specific sections of your code for execution length.

If you had <div id="timetaken"></div> somewhere in your HTML, you could add

document.getElementById('timetaken').innerHTML="Time taken: " + elapsed;

And then when your code completes it would display how long that bit of code took to complete in your HTML so that you can see it on a mobile device.

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