As you probably know the minecraft font renderer is very slow and there is a huge performance hit when drawing lots of strings at once (I go from 500 fps to 90 when opening the tablist on large servers), and in various guis with lots of text. It would be nice if the font renderer could be improved to mitigate these issues.

I think this is already covered by ImmediatelyFast.

I think this is already covered by ImmediatelyFast.

It has incompatibilities with my mod unfortunately :(
(and they don't want to help fix it because it counts as 'hacks/cheats' so I'd prefer a solution from Sodium)

You're referring to RaphiMC/ImmediatelyFast#264 it seems. I don't think Sodium will be replicating ImmediatelyFast unless there's a good reason.