Sodium

Sodium is another FPS optimization mod that is the best alternative to Optifine mod, however, it boosts your game even further to the limits. Unlike Optifine, which includes its integrated vanilla GUI, Sodium mod comes up with its improved, dark user interface, where you can adjust all the graphical aspects of the game.

There are although some differences with the Optifine, such as this mod runs on Fabric API, and it does not support shader packs. But you can still play your shaders by just installing another mod on top of it called Iris mod.