It's not insane. FYI the fastest terminal (alacritty) achieves its performance by rendering via gpu, and it's written in rust. iTerm recently started doing it too.
But if you look at input latency benchmarks (there was one posted not too long ago on HN, maybe a month or 6 weeks ago) alacritty isn't close to the fastest terminal for pressing a key and being able to see the key on the screen.
IMO pressing a key and seeing it is the primary focus of a terminal.
IMO pressing a key and seeing it is the primary focus of a terminal.