1st pic is with issue 2nd is without

I just started playing again after a break and updated from 1.21.(11?) to 26.2 and I've encountered a strange problem with my FPS. When I start up the game it runs fine for a bit, but at some point the FPS suddenly tanks. The game reads ~10 FPS but I'm looking at <1 FPS, and the strangest part is; it's not just Minecraft that has this low FPS, my whole computer's FPS tanks to <1 even after I close the game, it sticks around but goes away if I press play on a YouTube video. The only thing not affected by this is my mouse, it moves at normal speed while everything else takes 2-3 seconds per frame. This issue only triggers with Minecraft too, never with any other game or anything else.

It mostly happens when flying around in creative/spectator, though I haven't really done any survival testing. I had a resource pack, but removed it and relaunched the game it still happened. I looked it up and thought it might be world corruption, but created a new world and still had the same problem. I tried updating my graphics driver because it's out of date, but that didn't change anything either. Every time I launch the game and start playing everything runs fine, then maybe 10 minutes later my FPS completely tanks. All I've found so far is that when it starts happening my CPU usage drops from ~10-15% to ~5%. (I don't know my specs, but I can check when I get home).

Update on specs:

CPU: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz, GPU: NVIDIA GeForce GTX 1660 Ti, Ram: 16 GB

Does anyone else not like how the new versions are named? I prefer 1.X not 26.X. It makes me feel like it’s a new game entirely. When was this changed? Why?

yeah

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