Lag upon finishing building/unit & random

Hi Blizzard team,
I have been playing since release of reforged and suddenly since 1 week ago I am experiencing lags upon finishing building or unit production. I have not updated anything recently in terms of drivers etc. Indeed playing on the same PC since beginning.
I tried to scan and repair-> didnt help. I also uninstalled the game and installed again, also did not help.
It makes it quite impossible to play online versus, it also seems that when it lags my screen sometimes sort of jump out.

Definatelly not ping issue (approx 30 on Europe), also not FPS as it stable depending on the map/game 100-300. The lag is quite specific upon described actions ingame.

Any solution/suggestion?
Many thanks,
Peter