I found a phenomenon, the version is 1.17.1, when you press F1 to close the game GUI, FPS will increase a lot. But when you open the game GUI again, FPS will decrease. On my older computer equipment, it will be reduced by 20-40FPS, if you press F3 to check the FPS, it will be more obvious (I think it is because there are too many texts)
In other words, if you press F1 without the inventory GUI below, it will be smoother
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Thank you for your report!
We're resolving and linking this ticket forward as a duplicate of MC-249635, as that ticket contains more detailed information and/or has already been triaged by Mojang.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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May duplicate/relate to MC-178267