KenB - 3:05 am on Feb 11, 2010 (gmt 0)
Another thing to track is your "crawl stats under "diagnostics" on Webmaster Tools. This will allow you to see what the average download time is for your pages by googlebot. This can be used over time to see how scripting change impact page loading. This can be helpful in reducing processing time for pages, which is not only good for users, but nicer to your server.