Version 1.17.* exhibits extremely poor framerate on my MacBook Pro 2012, compared to version 1.16.5 on the same seed.
On 1.16.5 without Optifine, I obtain 30-40 fps, however, with version 1.17.1r-c1 I get approximately 20-25 fps, and often below 10. Map generation and loading is a lot slower (estimate 2x).
The poor performance seems to be linked to the "Smooth lighting" option, when I set i to "min" it improves somewhat.
Normally, I play with Optifine, so on 1.16.5 I typically get 50-60 fps, and the game is perfectly playable on my hardware. However, 1.17 is currently unplayable for me, the low framerate makes me dizzy.
Linked issues
Comments

Thank you for your report!
We're tracking this issue in MC-219639, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
๐ Bug Tracker Guidelines โ ๐ฌ Community Support โ ๐ง Mojang Support
๐ Project Summary โ โ๏ธ Feedback and Suggestions โ ๐ Game Wiki
-- I am a bot. This action was performed automatically! If you think it was incorrect, please notify us on Discord or Reddit
Duplicate ofย MC-219639.