**In previous versions of Minecraft, including 20w21a, my computer ran Minecraft decently well. It was under 60 fps most of the time, but that was no fault of the game, but rather, my own. In the latest snapshot, my computer tanked in performance while running. The game became barely playable, no matter which graphics settings I changed. The patch notes said, "If do you find any new graphical bugs then please report them to the bug tracker with the make and model of your graphics card as well as which operating system you are using." This is me doing that. My computer is running on an iGPU: specifically Intel HD Graphics 4000, in conjunction with my Core i7. My Mac is from late 2012.
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