Give Me GUI Lag & Desync Removal Methods

Hello, I’m creating a server and would like to have the best experience I can. It’s been a while since I created a server and was wondering if there’s any good methods of removing gui lag (that can be done from server side) and fixing desync. I noticed that on my servers I sometimes have problems where other players cant see players that are infront of them. Along with qb-inventory gui having a bit of lag. I appreciate any responses.