Deleting or disabling Grass , Clouds , SunRays , and Bloom effects.
As of 2024, Roblox has added in the official settings menu. To access it: Open the Settings menu while in-game. Scroll down to the Graphics section. Roblox FPS Booster Script
Roblox staff have explicitly stated that using FPS unlockers is not a bannable offense. Deleting or disabling Grass , Clouds , SunRays
Setting the transparency of textures, decals, and particles to 1 or deleting them entirely to reduce draw calls. Types of FPS Boosters Deleting or disabling Grass