Well, there's Qt that's relatively popular. Also WxWidgets. Java applications have had much success for x-platform GUIs (Jetbrains products come to mind) but is hardly considered lightweight (although much lighter than Electron-types).

Personally, I lean towards Lazarus.

All of the above (and I'm missing quite a few here) are insanely lightweight and performant compared to Electron-type implementations.

> Explain how it's better than this, and how we should all be using it, instead of this.

I did not claim that "all of us" should be using the alternatives. I said that, while in general I agree with using the quickets x-platform dev stack, for this particular application which claims "performance" as it's main goal AND further goes on to claim actual performance as a delivered result, I disagree that it is in any way as performant as it could be.

I mean, a quick win here would have been to use one of those alternatives I listed, maybe Qt. C++ GUI (using Qt) with Rust application logic would have probably been faster to develop than Html/Js + Rust, and the result would run just as fast (if not faster) and use less memory.

I'm inclined to use some of my precious free time to write a bare-bones x-platform GUI chat application, inventing my own protocol (like Linen did) just so that I have something to point at when invariably the claims of "performant" in electron-type apps is made.