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You don’t notice the delay of a slow terminal until you use a fast one. After that it’s hard to go back. Typing and tab switching are noticeably faster.

But I alscritty/kitty are fast too. It’s more a comparison to terminal.app/iterm and others.

It matters a lot more if you use vim at a huge resolution, or anything that sends a lot of control sequences. Terminal.app and iTerm get sluggish.

Its selling feature is it looks 'native' for Mac and is GPU-rendered. I don't find that important personally, it's just a box with text in it...

Yeah. “Fast” in what sense? I tried printing all unicode characters in 80 symbol lines and scrolling the screen of several thousand lines does not freeze only in terminal.app.

Aside from some bizarre tests and benchmarks like this in normal life I don’t know what could be considered slow.