FPS++ is a client-side (won't support server-side) or modpack comprised of the best performance mods (e.g. Sodium, Starlight and Lithium, along with many more) and libraries/API mods (e.g. Fabric API, ...

Although, we aren't quite at the 1.20.x stage yet. Right now, CheatBreakerX is in development. The versions being currently worked on include 1.8.9, 1.9.4, 1.10.2, 1.11.2, 1.12.2 and 1.14.4 - though ...