Power Save Mode - Exact Details?

Does anyone have a list of exactly which background processes enabling Power Save Mode turns off?  I know it's supposed to turn off inspections, but what else is changed aside from that?

Reason for asking: When my PhpStorm starts to lag it helps to turn power save mode on.  However, if I manually turn off ALL inspections and syntax highlighting, PhpStorm still lags all the same unless I EXPLICITLY enable power save mode.  So I ask myself.. what else is Power Save Mode turning off?  There must be something else other than inspections that's causing the lag, and I'm wondering what it could be.  

Since inspections do not seem to be the reason for the lag, I'd rather selectively turn off whatever is actually causing the issues and leave inspections on.. or at least see if that helps.  

Any insight would be much appreciated!!

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