Will Valorant make my laptop slower?

So i had downloaded valorant once but then had the feeling that it slows my game (roblox)

Is that true or does it seem so to me?

and will I take my cpu valorant even if it is closed?

As far as I don't know, and if so, only extremely little

When the game is closed, it doesn't load your CPU, maybe it's the anti-cheat software that's still running in the background, have a look!

Indeed, the AC software is a problem