Consider for Photon

A mod that fixes random memory leaks for both the client and server

Particle optimizations: Culling, rendering optimizations, configurable particle-type-specific spawn reduction, and potion particle disabling. Compatible with Sodium, improves performance over Sodium alone.

Improve and tweak Minecraft thread scheduling. Fork of Smooth Boot for ≥1.20

Async particle tick, GPU accelerated particle rendering.

Vanilla Worldgen optimization mod

Distribute HUD updates over multiple frames to improve performance

Mix of small optimizations for your Minecraft

A port of a mixin mod Nothirium to 1.8.9.

Removes configured rendering layers to increase performance when rendering items, armor, weapons, etc.