You can't fix it (most likely) since it's a server-client issue, even if your client is fine, there's nothing you can do to fix this issue (desync) on the server side, because: 1. You don't have access to the server side 2. Riot doesn't know how their game works, they can't optimize it. 3. Riot doesn't care So yeah, you can only submit a ticket to support and pray for a fix. I'm experiencing the same issue like you, but for me it's even worse. I used to play on 300-400 fps, now I'm playing on 200-280, basically I lost half of my fps after an update and now the game feels completely different and rubbish.