Abilities work with Delays / lags

I’m on gr 150 with inna fire build , and the abilities have 1-2 seconds delays , the hero moves sluggish , the fire allies forget to attack sometimes .
I’ve got a ryzen 6 core , with a radeon Rx 570 series , just don’t tell me my specs aren’t enough to play d3 , everything is set on low or off . My drivers are up to date .
My internet optical fiber …
More then 10 mobs on the screen and there is delay ?
How can this be ?