ADD flux mod

[ionic tapir]

Flux mod: Flux optimizes the rendering of blocks and ensures that all currently invisible entities are not rendered, resulting in a higher FPS rate.

The concept is from labymod client,pls try and add this mod/feature

Pls add as it will rlly help ppl with low fps and bad pc's

Even if u cant add this mod, pls try to add a mod/feature similar to what I said above

[astral moss]

isn't this just entity / block culling