Earlier quoted context omitted.
Javascript is plenty fast, I don't see why you shouldn't use it to power a browser.
It's not just about the speed of executing Javascript code. The UI is rendered with the browser's rendering engine. I've used Atom and it was a disaster, so I no longer trust any desktop applications written using that technology. I think that if you're going to write a desktop application, you should either use your native platform's APIs or pick a GUI toolkit that can give you a native look and feel. It'll give you…
Yes, the performance will matter. But as Servo demonstrates there are a lot of speed gains to be made with the right design.
See this talk by Patrick Walton about Servo's WebRender: https://air.mozilla.org/bay-area-rust-meetup-february-2016/#...
And this short demo comparing Chrome, Firefox, Safari, and Servo: https://www.youtube.com/watch?v=u0hYIRQRiws