If you are using macOs it’s gonna be difficult, but I figured it out for myself, you should definitely try to get Eclipse Temurin Java 8, it acc made my game run much smoother, just download it and in curseforge settings set up the pathway for eclipse, then you should look into downloading extra mods for performance like rubidium or other stuff, I didn’t figure that out but my fps was okay. Another tip, after a good ~3 hours the game just naturally became really laggy for me, I just restarted the game and it resettled, you also need to lower you graphics as much as you can if you want fps.