What is a good tool or site to use to performance

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What is a good tool or site to use to performance test a web page/site? I am trying to find a good baseline to detect how fast my page will load on one hosting provider vs another. I initially used http://www.freespeedtest.com/ but like to get opinions and links for others.

Answer 1

Firebug with YSlow is a pretty common combination. Google also has PageTest which is another plugin which works with Firebug. It has a few different rules and such but is still pretty similar to YSlow. I like using both tools for initial testing since they can provide very simple and fast results.

Once you have started making optimizations and you want to see how performance is changing I would recommend using Pagetest. It provides a web interface for YSlow like performance results/analysis along with really nice waterfall charts to see where time is being spent. Perhaps the two most useful things about Pagetest are that 1) it allows you to easily perform multiple trials and 2) it gives clear results for cold and hot cache cases. I have found that multiple trials is the only real way to get realistic performance results, there is simply too much variance in single trials.