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Reproducible results for LWN review of terminal emulators: https://lwn.net/Articles/749992/ https://lwn.net/Articles/751763/. Mirror of GitLab repository, possibly out of date..
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st
build of the suckless simple terminal with patches for alpha, font2, copyurl, openclipboard, invert, appsync, xresources, scrollback, w3m, keyboard select, boxdraw (by mrdotx)
Because I really like Terminus, I can't use certain emulators (kitty). Alacritty supports bitmap fonts, has a WAYYY better configuration method, and has a lot of features that are really nice, but, from my (subjective) experience, I feel like I can feel the difference in latency. I ultimately decided that I was more interested in that feel than I was in other features, though the difference isn't dramatic. Plus, using completion through cmp basically negates this low input latency: you can really feel the difference between using cmp and not.
That last reference builds off of the work of the other two. It also breaks down how NOT modern Xterm is, but, if I've read it correctly, it confirms that its input latency is low compared to all other tested terminal emulators, including Alacritty and ST, which humorously and justifiably thrashes Xterm on its homepage for being a bloated program. Its not a good choice for everyone: it has poor right-to-left text and Unicode support, making working with Chinese, Arabic, and other alphabets not great, I've read.