Hey guys, is it allowed to use some shader packs? I downloaded a few from https://shadersmods.com/shaderpacks/ They just add lighting, shadows, and so on, no extra features are added.

What's the reason to so? I know it looks better but when your Speedruning i think it's better to not use one considering even the performance differences. Hope that answer helped atleast a bit ':)

I use a few lag-less on my potato PC to enjoy a few extra FPS.

you can not use it. refer to the RULES to find which mods can be used