Knowing John Resig, we'll get a blog post in 6 weeks showing a 30% speedup in jQuery in ie6 and 7. This man is a machine.

I think dynaTrace guys did something insane. Kudos!

Believe me I was doing some IE stuff (BHOs) and working with their COM extension model is one of my worst experiences (right after creating installer using WiX system).

btw. check out my web-dev tools at http://binaryage.com :-)

That is pretty incredible. I thought that the "Develop" menu and JavaScript profiler in Safari were great, but this deep tracing tool looks even better.

I wonder how this gets such detailed information about network and DOM events without injecting debug signals into the browser binaries?

Anyone have any tips for memory profiling tools, other than the one mentioned in the article comments? (http://www.softwareverify.com/javascript/memory/feature.html, Windows-only, Firefox-only, non-free)

How hard would it be for browser makers to make the kinds of information this tool needs readily available (instead of the tool maker to write very low-level code, basically a giant hack) and how much work would this save for the makers of tools such as dynaTrace?

This is head and shoulders above Fiddler 2 for giving you a complete picture of what's going on.