latex3 VS texmacs-vi-experiment

I never got deep into TeX, but I browsed the code at one time and some of what I found seemed utterly insane to me. For example, it includes an IEEE floating point implementation, based entirely on TeX string expansion [1]. I don't know if it is widely used, but I'm not surprised by slow LaTeX compiles anymore.

You say "TeX is already heavily optimized", but that's only true for the layout engine. The input language is entirely based on macros and string expansion. That's fine if you're only going to use it for a bit of text substitution. But as a programming language it's inherently slow. (To be fair, I believe Knuth expected that large extensions, such as LaTeX, would be implemented in WEB.)

[1] https://github.com/latex3/latex3/blob/main/l3kernel/l3fp-bas...

> TeXmacs necessitates using its own interface (which lacks my vim keybindings and Emacs customizations)

TeXmacs's own interface is deeply customizable by the user via Scheme.

I think you can set it up to have vim keybindings---see experimental code at https://github.com/chxiaoxn/texmacs-vi-experiment and comments at http://forum.texmacs.cn/t/a-very-tiny-vim-in-texmacs/176 (I know that the lack of a block cursor has put off someone, but I did not find that comment in the brief search I did now).