I don't really notice any difference in doing day-to-day stuff, but I tried out tree across my entire ~/projects dir and got the following results:
XTERM:
28032 directories, 196844 files tree projects 0.65s user 1.19s system 56% cpu 3.229 total
KITTY:
28032 directories, 196844 files tree projects 0.62s user 0.75s system 55% cpu 2.475 total