I think a more appropriate comparison for VSCode would be Nova, which is angling for roughly the same IDE-capable editor space. And uses some of the same technologies (LSP, TextMate themes) I’m not at my desk so I can’t compare at the moment, but I remember Nova feeling vastly more responsive and quite a bit faster from launch to usable.
And VSCode performance (especially launch) degrades significantly once you have several workspaces open at once. I’ve learned to dread upgrade launches because the release notes tab amplifies that degraded performance even more (which is baffling because that’s just one more web thing in the same web context right?!).
Don’t get me wrong, I love VSCode, and it’s worlds better than most other Electron apps I have to use. I even went back to it from Nova because it better supports my workflow. But it is definitely slower than it could be if it were native.