WebKit's developer tools measure energy impact!
@krinkle nice! this tool has been in xcode's profiler for native apps for a while and it's pretty great.
As far as I can tell the value is an approximation scaled from various usage figures, so it gives you some sort of "relative impact" rather than a literal scale of current drawn, but given how hard it is to measure electricity draw globally that's probably fine. :)
There's also the Intel Power Gadget which can show the actual power draw for the CPU, integrated GPU, and RAM, which is sometimes useful!
@krinkle oh the intel power gadget also shows CPU frequency, which is missing from every other profiling and CPU monitoring tool on the Mac I've seen. :P
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