browser rendering profiling tools

What are some free 开发者_如何学Python(and not free) browser profiling tools?

I know of a few:

• firebug profile / net panel
• YSlow
• google's version of yslow (forget the name)
• dynaTrace Ajax (free)

Am i missing anything?

Thanks

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IE8 has a nice one.

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• Opera Dragonfly
• WebKit Inspector