my entitys are bugged for some reason. ive installed fabric loader + sodium and it happens since then im pretty sure. tried reinstalling etc.

i dont get real spikes anymore even if some structures are close. anyone had a similar problem? cant explain it exactly but its different for sure, because before it worked fine
ive checked everything with entity distance, chunks etc and im kinda lost now

Well, you should probably ask this question in the minecraft java forums, not here. But there are some performance enhancing mods that are allowed. For pre 1.16, you can use optifine, but it is banned for 1.16+. For 1.16, you can use phosphor, lithium, or sodium.

My pc also runs minecraft poorly, and if you want to keep the game vanilla, you can always turn down your render distance, change the graphic quality, turn off clouds, and close all other applications running in the background.

Off-topic discussion, unrelated to speedrunning.

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