The bug
Due to the new OpenGL 3 render engine, the animation of End portals and End gateways is now choppy. It's not a fps issue. Everything else goes fine.
How to reproduce:
Go to an End portal or an End gateway (you can also use /setblock or /fill).
Just watch the portal/gateway animation.
I have recorded a video featuring the issue: https://streamable.com/2eiuey
Linked issues
Comments 3
Cannot reproduce. Does this also happen in a fresh world? I wonder if this has something to do with many particles and/or entities, as your particles/entity count is relatively high.
I'm unable to reproduce this in 1.17.1-rc1, so this might be the same issue as MC-227557. Can you check if the issue still happens in 1.17.1 Release Candidate 1?