Well, I haven't actually tried PaperTTY on a Pi4 and it's very likely there's room for optimization to at least make better use of the multiple cores. Do you use it in TTY or VNC mode? I don't think it should take very long to process an updated frame, but with a display that big, simply sending the data to it might take a while. With partial refresh there shouldn't be too much data to send though...

I only used TTY mode so far

I've done some profiling, because I use a Pi Zero (with a 6" display) and the problem is even more pronounced there. I only use TTY mode. It seems pack_image in driver_it8951.py is rather slow.

I also tried to profile:

import time

for i in range(1_000_000):
    print(i)
    time.sleep(1)

I ran this program run until it started scrolling the terminal and then profiled with py-spy for two minutes. Whenever spi_write was running, py-spy had trouble getting samples so it realistically it spent even more time in spi_write than it recorded. Anyways, this is how it spends its time and when it's scrolling like this I get a new image roughly every 8 to 15 seconds.

Test IT8951 displays #32

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