I've found every Electron app I've used to be terrible. This includes VSCode. In fact compare VSCode to Adobe Brackets - both of which are using web technologies as their framework but Brackets is a node.js application while VSCode is Electron, and you'll see just how badly Electron performs when even compared to similar technologies.
Oh it's definitely slow compared to the likes of Sublime Text or vim. But compared to Atom, VSCode, etc Brackets feels a lot snappier and less memory hungry.
This is what I've experienced on 4 different hardware platforms however all running ArchLinux so YMMV.
