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Alacritty has kind of a lot of input latency, it's noticeably worse than wsltty and the default WSL terminal -- at least back when I checked it a year ago.

I think some work has been done to improve it, but at this point IMO if you're on Windows then wsltty is as good as it gets for a general purpose terminal. If you're on Linux, xterm is top notch.

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I don't know, I've got two panes here opened next to each other (tiled/xmonad) with xterm and alacritty, and I've been typing in those for the last 5min, and I really can't tell the difference (my monitor has 5ms latency).

Does it have 5ms response time or "input lag" because both are very very different and input lag isn't a spec you'll find on the box.

You typically need special hardware to measure it, or find review sites that go out of their way to cover it.

What's top notch on Wayland?

I never used Wayland, sorry.

Xorg

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