Internet Explorer 8 Beta 2 brings the Developer Tools closer to realizing the full potential of these benefits with significant improvements to existing features and new functionality meant to make you more productive.
Profiling and Debugging JScript: Beta 1 introduced a JScript debugger that lets you easily debug Jscript within Internet Explorer. In Beta 2, we’ve made a few great improvements: it now supports Console.log, just-in-time debugging, and has better usability through changes like an improved file chooser. However, the debugger only helps get your site working properly and you need to make sure your site works optimally. That’s why Beta 2 includes a built-in JScript profiler. Use it to build high-performance web applications in Internet Explorer by finding hotspots and comparing different design patterns. Simply press ‘Start Profiling’, perform you scenario, and press ‘Stop Profiling’ to view profile data for all JScript, including built-in methods.