Since these are community projects, they are hosted on third-party modding platforms. You can find various V4 optimizer packs at these locations: CurseForge FPS Booster for MCPE page to find highly-rated performance packs like Pure Optimizer Alpha Optimizer YouTube Showcases
: Allows you to adjust or completely turn off fog for better visibility and performance. Clear Water Optifine V4 For MCPE 1.20
OptiFine is a Java Edition mod that optimizes performance and adds shader support, zoom, dynamic lighting, etc. It cannot run on MCPE/Bedrock because Bedrock uses a completely different codebase (C++ vs Java). Since these are community projects, they are hosted
The 1.20 update introduced:
: Makes water more transparent for better underwater visibility. Smooth Lighting Since these are community projects