Lag/freeze issue since yesterday

Hello,

I've had some strange issue since yesterday and i'm wondering if anyone has had the same/ can help me on it:

It seems like my computer is frozen by the game every now and then, then the game catches up in time.

I noticed that as I was streaming and it was freezing the whole stream (see the issue here), but my bitrate was always good and steady (checking through twitch and streamlab tools).

I also did some games with a friend and bots and after a bunch of freezes I was delayed in game (so everything I was seeing already happened and every input was delayed, we went up to 3minutes of delay). I tried also offline against a bot alone and the freezes still happen and go worst as the game goes (but no delay, same as ranked).

I tried to restart my computer, repair the game, restart my router, none of this worked.

It seems like the game is too heavy for my PC but it started happening only yesterday and I didn't change anything on my PC. I have something like 1250 score on the performance test, so I shouldn't have much issue.

Any idea of what causes this problem and how to fix it?