It's probably so obvious that it does not merit a formal test. Atom and Vscode run on Electron, an entire instance of the chromium browser that renders the UI in HTML and CSS and uses JS for logic. Sublime Text is a native application with a much more efficient system for rendering the UI that does not involve web technologies. Open any of these editors for yourself and note the CPU usage: it's a disparity representative of a web browser (which atom and vscode are!) versus a simple text editor.
I'd also add that VSCode and Atom don't support the conventions used in text editors on the native OS. There are several keyboard shortcuts that "just work" in Sublime Text – which I'm used to from Mac OS in general – that don't work at all in the Electron-based applications.
