I dunno, I'm just not a fan of Electron-based apps especially for a text editor or IDE. Native desktop applications always have such superior performance and memory-management.
VSCode does seem pretty nice -- One thing I can't figure out is the Ctrl+P quick find. It doesn't seem to auto-complete/open files I have added in explorer? The same behavior works flawlessly in Sublime.
I find it to be a bit hit and miss. Sometimes it just takes 5-10 seconds for the results to appear, for no apparent reason.
VS Code startup lasts at least 100 times longer than ST3. It also takes twice as much RAM. Maybe on your PC it's not noticeable, but the difference is there.