Notewell rendering its own README.
Notewell is a cross-platform Markdown editor written in Haskell using gi-gtk-declarative.
It uses cmark-gfm to parse Markdown blazingly fast and renders to a TextView -- so there are no browsers involved here.
While Notewell has reached 1.0, a state of basic day-to-day usability, it is still very young and far from perfect.
If you'd like to try it out, you can build it yourself or buy a binary for your platform through the website.
Efficiency can be hard to measure, but here are some subjective examples from my personal usage.
On a fresh start on my development machine, Notewell uses only 10MB of memory as of version 1.0 (hopefully this will be improved even further in future!).
When editing a very large file as below, Notewell copes well, being able to shrug the file off and update its Markdown rendering as normal.
