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yeah man I've been having this same issue
every few seconds my frames drop to a noticeable level (dropping at all is already an issue in itself) only on superflat worlds. This happens with shaders on and off, with mods enabled and disabled. I am having this issue on Fabric, but I thought I would post a similar issue in the same thread.
I think it might be the same issue as recently diagnosed FPS lag in the end
The cause seems to be LZMA compression
An improvement was added to the nightly from #links-n-downloads
Though there is no full fix yet
Context: https://discord.com/channels/881614130614767666/1383333905007906846/1383556563519672481