I have never found myself in the situation where my terminal emulator would be too slow and I‘m using it for the majority of my day-to-day work.
I honestly never ran into a situation where I would habe blamed the terminal emulator for being too slow.
and once you get used to things being that fast, it’s hard to go back (analogous to what people say about high-refresh screens/monitors)
all that said the speed of the default mac terminal (and other emulators I tried) was always fine for me, performance was not why I switched to Ghostty
I first started to understand and notice update rates and responsiveness as a gamer playing 1st person shooters.
I hate (ok, I find it a bit jarring) the jerky scrolling of a phone in battery save mode limited to 60(?) FPS. It’s so obviously not connected to your touch anymore.
In terminals it’s things like the responsiveness fuzzy finders and scrolling that I really notice.
I turn off animations everywhere I can.
It’s not impossible to use something slower, but when everything feels instant it’s just much more pleasant, smoother, and feels more productive as a result of the computer working at whatever speed my brain does.