[RandomX] Foreground applications slowdown
I apologize if this was discussed before.

I think it's no secret that RandomX algo is very heavy and demanding so i don't expect anyone being able to do something about this but nevertheless i just report my findings just in case.

My case :
Priority 0 - idle
Yield enabled (as by default)
Microsoft Word and Excel (for Windows) : extreme lags when typing, scrolling and general workflow.

I think some general slight slowdown, especially on low-end machines like (i3 6100/7100) is noticeable overall but it's extremely noticeable in Microsoft Word and Excel for some reason, even with aforementioned settings it feels like the miner has normal priority or higher. There's nothing even close to that with other algos, hence me thinking that maybe that's started with some recent version but nope, still the same with the XMRig 2.16.
