Q:

Measure CPU load of Javascript applications

I need to measure the performance overhead of additional Javascript event bindings (using jQuery live), the overhead would probably increase CPU load and be very hard to notice from execution time profiling.  
How can I measure the CPU load differences between two different versions of a Javascript application?

A:

Another option for analysis is dynaTrace Ajax edition. Resig has a quick overview of it here. It's specific to IE (but...that's the one with the worst performance in most cases so...)  
Take a look, all the suggestions here are great, if you're looking at IE issues (some intranet apps are locked down to it) then dynaTrace is an excellent and still free tool.

