Lite XL:

A lightweight, simple, fast, feature-filled, and extremely extensible text editor written in C, and Lua….

We are currently around 3MB in size and takes about 10MB in RAM (can be lower). No Electron / WebView involved. The whole thing is just Lua running on a rendering engine.

I downloaded Lite XL because it's written in Lua and I just had to check it out. I was shocked at how fast everything loaded. It's amazingly fast. The UI ins't exactly stellar on MacOS, but the feel of the editor absoutely is. It's fast and tight and makes me smile, and I wish all software was this instant.