As a developer I will mind if it's not fast though, or if it does not behave like other native apps. The fact that it uses more memory is not a fact that stands alone either. The reason it uses more memory is because it has to do more. Because it has to do more, it's always going to be slower.
So far on Fedora 21, VSCode is a slow and buggy experience. Atom was never as good as any of the native dev tools that I've used IMO. As a matter of fact, I can't think of one application developed with web tech that performs as well as it's native counterpart.
