[1] https://josephg.com/blog/electron-is-flash-for-the-desktop/
Sublime (or really any competently-designed native editor) does indeed use way less memory for any text-editing task than any Electron-based app. But memory is fast. VS Code shows that an Electron-based app can exhibit performance basically equivalent to a native app at most tasks (other than opening that initial window, where it's still an order of magnitude slower).
So I think the performance problem with Atom is more Atom than Electron.
(Still, though, if you only have 16GB RAM, you probably don't want to use more than 4 Electron-based apps.)
VS Code chokes pretty horribly on 'large' files and is really slow to load. It also has noticeable typing latency vis a vis Sublime.
My comment wasn't intended to advocate for inefficient software based on web browser cores; I was just trying to note that most of Atom's abysmal performance issues seem to be more Atom's fault than Electron's, since VSCode is so much better.
Sublime, and any competently-designed native text editor, will always be faster than one based on Electron. Still, I leave both editors (and a few others) open throughout my workday.
But, I do agree about Electron. Worst thing ever for desktop apps. When I look at my process manager, I wanna cry when I see 10+ apps taking 500+ MB each when native one would take like 30MB.
Vscode is comparatively young but it might already have the broadest support for things like semantic completion/go to source/step debugging and being written in electron might have played a part in that.
That said, I am not 100% sold on it yet. The killer feature of Atom.io for me is that it is cross-platform. For most developers that shouldn't matter but have been working on some platform-agnostic web development tutorials and for that use case, there really isn't any valid alternative.