To be fair, it's not hard to outperform something written in Electron with native code with a factor of ten :) Anyway, this is really impressive, so good job!
V8 can also JIT JS to something that runs fast, although the extra layers of abstraction between web code and platform interfaces do not help, and V8 can only do so much.
It was able to perform search and replace at an acceptable and responsive pace, nearly instant.
With VS Code, loading in a big file usually crashes it.
Thankfully I don’t have to deal with this as much as I used to.
Electron makes it easier to build cross-platform apps, and certainly cheaper, but it's not like it's the only way to do it.
I use all three major operating systems on a daily basis, and typically preferentially prefer single-OS apps, as I can typically expect them to be more performant and to better follow a platform's UI conventions.