I didn’t.
I enabled it and view framerate and memory, but the issue isn’t/shouldn’t be the CPU, it’s the GPU.
My CPU runs at less than 30% with it running; when I did a test, my GPU (if I recall correctly) was maxing out on usage (or just running high) while not really doing anything, like say I zoom in at a small enclosed area in Flat-shading (a very lite task), it’s still running hard.
It’s as though UE4 is caching a lot of the GPU “JUST IN CASE” but not (if ever) using even half of it.
Enabling this only helps for when you’re not “in” UE4, but obviously it does nothing for when you would actually care the most (that is when you’re actually using it.)
With it disabled, fans run high in and out of editor, but not without editor.
With it enabled, fans run high in the editor, but not out and without editor.
Are you suggesting I raise minimum CPU fan level to above 35% to use UE4 without loud fan (I don’t know where it’s at right now)?