Uncontrollable lag around armor stand based things

[Vexthefish]

About a day ago, my FPS has started tanking from 400-600 to 15 when I'm around armor stand based builds (experimentation table, composter, etc). Everywhere else that I go, my fps is stable anywhere from 200fps+. I've never had this problem before, so it was a little shocking. I've messed around with my settings, tried removing some mods, and nothing has worked. I was wondering if anyone had any ideas?

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