I have a few scripts that use jQuery, and I think I have a memory leak in one of them.
How one could profile and find what parts of the scripts that I have are using the most memory/CPU?
Regarding memory consumption
IE, Chrome and Safari have built in profilers in the web development tools that ship with the browser. For Firefox you may use Firebug. Also useful may be, since you’re using jQuery which means your profiling report will be filled with anonymous functions and alike, making it quite unreadable, John Resig’s jQuery profiling plugin, which will give you a clearer output on the matter.
Use Firebug. To quote from http://getfirebug.com/js.html:
To use the profiler, just go to the Console tab and click the “Profile” button. Then use your app for a bit or reload the page and then click the “Profile” button again. You’ll then see a detailed report that shows what functions were called and how much time each one took.
I would suggest taking a look at the profiler in Firebug, and the Drip plugin for IE to help look for memory leaks.
document.getElementById('foo').bar = myObject;). If you must create these circular references, be sure to break them yourself in a function that runs when the page unloads, or when removing the DOM objects prior to unload.
Google Chrome also has profile options
Another simple way to test a specific piece of code is to add a timer around it.
var testStart = new Date(); // code to be tested here $('#jstest').html("selected function: "+ (new Date() - testStart) + " milliseconds");
Where jstest is a span element somewhere visible on your page.
I hope this helps.
Firebug or Google’s Page Speed for Firefox have profiling tools.
This post by John Resig (jQuery) may be helpful for detecting memory leaks in IE: