I'm not sure if this is the game itself but I'm having unnecessary lag spikes in parts of my world that I didnt use to have lag in, with all my settings the same as they were.. Im not sure if it is optifine causing this or minecraft itself with the new update </3
it only happens in certain parts where i should be getting 100-200 fps, but they drop to as low as 60 in only certain parts. let me know please!
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Yes it happens without Optifine as well, although I dont play without Optifine. I never had any issues with frame drops before I updated to 1.17 and its just super duper laggy in places that previously were not laggy at all.
It could be on Optifines end but I wont be able to tell until they release a full version of it, but like I said above I never appeared to have any issues in the parts that Im having issues in now. I used to be able to keep my render distance on 20 with no problems but after the update I had to bump it down to 12 or I wouldnt hit anything above 70 fps when my normal is 200-300.

Details about what parts of the world are necessary to pinpoint the issue. Providing more information regarding where in your world these spikes are occurring will help diagnose the problem.

Mostly just inside of my house where I never used to have lag issues, near my iron farm which never caused any noticeable lag & by another one of my farms in which again never had issues regarding lag or FPS drop, it seems to be fine when I get away from the area but It does also occur in newly generated worlds when walking around.
My PC specs are pretty decent so I shouldnt be having any issues seen as I never had issues regarding FPS drop, or lag before I updated to 1.17.

CheckΒ MC-219639. Vanilla only here.

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Does this occur without Optifine? Mojang does not make Optifine so bugs that are caused by it are not valid on this bug tracker.