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The Profiler allows users to observe JavaScript activity and get statistics related to it.

CPU Profiler

CPU profiling allows to get statistics about JavaScript function calls. This information includes the following data:

Column Description
Function Name of the called function ("(?)" or "anonymous" for anonymous functions)
Calls Number of calls to the function
Percent Percentage in time in comparison to all function calls within the profiling session
Own Time Time spent within the function (time spent within functions called by that function are not taken into account)
Time Summary of time spent within the function of all calls
Avg Average time for one call of the function
Min Minimal time spent within the function
Max Minimal time spent within the function
File Name of the file plus line number, in which the function is located

See also

Memorybug - Firebug extension for memory profiling