I have a moderately beefy computer that runs Minecraft very well. In the current modpack I'm using (euphoric curiosity) I get a solid 200-250fps, but it always dropped to almost none in the nether. this also happened to my other friends who were playing the modpack. WE tried removing mods one at a time and the second we removed mcdoom the lag completely disappeared. It seems to be coming from the mcdoom mobs in the nether.

It is fully updated, sorry for bothering. After testing with other mods it seems to be a rendering issue in the pack because other mods with custom mobs like mythic mounts and endgame bosses are also causing lag. Thanks!

Ensured you are fully updated on 1.18 or 1.19. Ive done all I can via the culling in the latest.