There is a new, updated Modpack called "Reaper Performance". Please download it instead Mountain Performance.

Experience Minecraft like never before with our Phantom Community Modpack! Explore our server with optimized performance and technology improvements. Our modpack includes Forge mods for Minecraft 1.20.1, regular updates and a German community.

A simple modpack with various mods to make the game perform better. Play with a high framerate, but keep everything Minecraft-typical or activate a shader (pre-installed) to get more out of the game.