high cpu usage while running apps and games.

asus z170a , intel i5 6600k , 8gb ddr4 2133 , gtx 1060 6gb , 1tb 2.5' ssd - bazzite 41 while running apps like firefox, discord, steam the cpu usage i spiking really high and seems to be running higher then what i think is normal, at least compared to how the system ran on windows.... i could have all these same apps open no issues. but on linux if im playing a game on steam and have discord open the CPU goes up to 100% and game (portal: revolution) freezes. i read another post about CPU going to 100% and it mentioned RAM getting used for processing. is 8gb not enough? is 2133mhz too slow? is a 4core i5 6600k not good enough? any help is much appreciated!!