Firebug
Firebug provides a highly detailed profiling report. It will tell you how long each method invocation takes in a giant (detailed) table.
console.profile([title]) //also see console.trace()
You need to call console.profileEnd () to end your profile block. See the console API here: http://getfirebug.com/wiki/index.php/Console_API
Blackbird
Blackbird (official site) also has a simpler profiler (can be downloaded from here)
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