CSGO client lagging when i play faceit

Hey there. When I play faceit in CS, my client of the game lags, and I know that many have this problem, how can I fix it? The client freezes instantly.
The problem is that during the game on faceit, the client of the CSGO hangs/freeze for a few seconds (sometimes in serious situations, clutch-rounds, etc.). And I am sure that the problem is precisely in the faceit, because when I play regular matchmaking, I don’t notice this. There are no problems with a computer, powerful enough to play in the CSGO.
Thank you in advance