Dave posted a first part of Javascript Benchmarking on his blog.

As the name suggests this is part I of a series of JavaScript benchmarking blogs. The reason for these is to investigate the performance of various Ajax programming tasks. The first entry investigates how the XSL-T processors of Internet Explorer and Firefox / Mozilla (on Windows 2000) compare and how they compare to pure Javascript code that arrives at the same end result.

Notice that benchmark include only a comparaison between Msxml2.DOMDocument.3.0 object and the XSLTProcessor in Firefox. MSXML 4 and 5 will be posted in a next benchmark as he said.

The result are surprising as IE is faster to treat XML request for large table rows of data and XSLT. Firefox strangely manage XSLT data even if the all measurements were done 50 times to get the statistics and there was nothing significantly different on the system on which the tests were run.

I'll be interested to see more benchmark for more systems and more detailed specially the applications used. I know also that IE and Firefox don't work in the same manner from a windows to another, so making tests on more than one OS will give more accurate results.