Meanwhile, my similar era MacBook with dGPU hooked up to the same screen is very snappy and I honestly would probably not be able to tell the difference in a blind test between VS Code and typing in a native text box (like the one here in Safari).
I'd consider myself pretty anal about latency -- I was never able to deal with Atom's, for example (disclaimer: I haven't tried it in years). I even dumped Wayland for X11 when I had a Linux desktop because of latency (triple buffering or something?) I couldn't get rid of.
But VS Code is not bad.
At least in base-mode. It can becoming slower when the IDE-features kicks in and autocomplete needs some time to meditate about the stae of it's world. But this also scales with size of your active sourcecode, the codebase and used language.
Also, this is some problem of all IDEs, not exclusive with VS Code.
My Sublime Text is decked out in plugins and so on too, there are instances where it slows down but only when it's obviously doing some processing. The basic rendering is fast, totally unlike vscode. But like I said vscode is still "fine" just uncomfortable.