Reality: Lunar Client (and Badlion) is a launcher that bundles these exact mods (OptiFine, Patcher, etc.). Using Forge allows you to customize which mods you run, using less RAM overall. Lunar has a slight overhead because of its GUI overlays.
To maximize your FPS, don't just pick one mod. Use this specific combination. We call this the "Competitive 1.8.9 Stack." 1.8.9 fps boost mod
Do not install Fabric for 1.8.9. Stick to Forge. Reality: Lunar Client (and Badlion) is a launcher
False. Adding incompatible or redundant mods (e.g., two mods trying to cull entities) causes conflicts. Stick to the holy trinity. 1.8.9 fps boost mod