Check images below here for reference. This is what I experienced when I used a glow ink sac on signs and placed lots of them and the lag gradually increased like my FPS went down to about 40 frames.
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This seems very similar to MC-5169. Does the same amount of lag occur on signs without glow ink sacs applied to them?
No actually
The ones without glow ink sacs dont reduce as much lag as oppose to glow ink sacs.

I cant reproduce the issue when using the partial fix for 5417, so either my partial fix applies here or it has been fixed or I need another world example that I can load that shows the issue.

Can confirm in 1.21.2, and appears to be a much larger than in previous versions.
Before 1.21.2 my fps dropped from ~300fps to ~40fps.
Now, in 1.21.2, it goes from ~300fps to <10fps.

This is most relevant for version 1.21.5. It is simply impossible to play on servers after switching from 1.21, where everything worked fine. FPS for all players, regardless of their graphics card, drops from 400 to 60

I'm surprised no one is shouting about it, because it just kills the game completely.

on the rx580 graphics card:
on the 3060 graphics card:
[media][media]
This is during while I was near them and away from them according to the perf chart.