Profiling Settings: xdebug.profiler_enable / xdebug.profiler_enable_trigger Tools: KCacheGrind (Linux) WinCacheGrind (Windows) maccallgrind (Mac, non-free) webgrind (PHP script, multi-platform) Browser extensions: easy xdebug (firefox): xdebug helper (chrome): xdebug toggler for safari: xdebug launcher for opera: