Unfortunately, due to some unorthodox ways the mod functions, many modders will refuse to accept bug reports if OptiFine is also present in a pack, and will fervently argue against the use of OptiFine. However, because of its general performance improvements, many players recommend using it in most mod packs so long as it does not cause other problems. OptiFine is not included by default in any FTB mod packs, as its author requires express written permission to redistribute the mod outside of its forum thread or. As a related point, a small number of mods use custom-made rendering systems that may not work alongside OptiFine Chisel in particular has been known to intermittently have its textures become invisible in OptiFine's presence. As with all mods intended to improve performance, although it is rare, it is possible for it to decrease performance.

OptiFine is a purely client-side mod and will crash if loaded by a server. It was designed to overhaul Minecraft's lighting and rendering systems to increase their efficiency and visibility.

OptiFine is a utility mod created by sp614x.

Minecraft 1.18 optifine