[ggambetta]

I'm using Typora, which works pretty well for this use case. Open source, cross-platform, very nice. I'm in no way affiliated with it, I just like it :)

I get the parsing difficulties. Generally, at least for markdown, pressing a character should affect only the line (paragraph) that contains it, so worst case scenario, you need to parse the entire paragraph. Worst case scenario, you need to re-render whatever fits on the screen. I refuse to believe it's not possible to do this efficiently with 2020 hardware, and I have proof, in the form of editors that work.

If it's 2020, I try to append a character to a 400k file I have open, and this takes multiple seconds, it's because someone implemented Schlemiel the Painter's Algorithm, not because the hardware is slow or the file is too big.