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I’ve been doing some Xdebug profiling on LightPress to ensure that speed is properly balanced with memory usage, thanks to some tips from Sencer. While I was at it, I thought it might be fun do a few profiles on my WordPress development site.

Xdebug offers numerous profiling modes, but the one I’ve used here is the “Total Execution Time” (4) profile which sums the excution time for each function call and lists functions in descending order. E.g. if the function apply_filters is called 10 times, the total will show the sum of the 10 separate calls (note that further calls made within a function count do count towards its total). This is a useful profile to determine which functions make up the bulk of WordPress processing time.
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