getting really bad frame rates in latest 21w10a, I'm on an iMac late 2012 with Nvidia GeForce GT 680 with 2GB video ram and 32 GB of ram.
Previously played with Minecraft 1.16.5 vanilla and the previous snapshot 21w08b and no issues with frame rate.
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This is a duplicate of MC-218879 - please add any information you have to that ticket
It has been decided that these types of performance issues will be linked to this report: MC-219639.
Please follow the instructions on that ticket to document your performance decrease so that it will be standard with others who experience similar problems.
I lag a lot