I think the problem with basing anything off of Electron is that the stack is just too daym high and depends on so many things out of your control. Not to mention Google owns you and your application and could add stuff to Chrome that snoops on your users...

It becomes impossible for you to do any sort of quality - even making the original choice to use it means you care about the perceived "convenience" of using CSS and ECMA over performance.

You're comparing a software that runs locally to a service that runs mostly through the network. A fairer comparison to vscode would be emacs.

Suboptimal code might have something to do with it as well, though.