FFA games freezes

Hi everyone.

I wonder if anyone facing freezes in FFA games once it have 10+ players ingame. When it is 16ppl the game is just unplayable.
The thing is that it happens ONLY in FFA games. Any map, any weapon, any server.
All other modes are OK.
FPS is around 130. Ping is 110-120.

I observed this found right after last update (10th anniversary March).

Sending support ticket didn't solve anything, those suggestions are for wooden PCs.
My computer is working perfect all other modes so nothing to do technically.