JavaScript Performance Monitoring Tool

Question

The company I work with is one of the largest betting companies in Europe, and the website has thousands of JavaScript lines on all of our pages.

Recently, versions of Internet Explorer prior to version 9 have been very slow, and I want to keep track of which parts of the page load (including scripts) are slow. I know that IE is generally slower and has problems with the DOM API, etc.

What I want to do is a way to quickly identify the slow parts and see if it is possible to replace the code with IE code that will display with higher performance.

Cheers, Stefan

Answer 1

I used dynaTrace AJAX [sic] edition and found this useful.

Answer 2

IE9 has excellent profiling features (F12).

Activate the development tools, click the profiling tab, and start profiling when working with your application. Stop profiling and you will see all function calls, time, etc.