Seems impossible to me that an electron app can respond as quickly as native code one.

Ignoring other issues I had, I ditched VSCode and went back to MacVim after probably 3-4 months specifically because of the input lag I experienced when typing. The input lag seemed to be tied to things like plugins looking up information like autocomplete, which, I know is more computationally expensive than simple text rendering but it seemed like VSCode blocked simple text rendering on waiting for autocompletion results.

I did have a number of other issues, but, I enjoyed VSCode enough that I would have stuck with it and tried to resolve. Now, I'm probably too old and too disconnected from code to actually switch.

Please don't just jump on the bandwagon. There are existing extensions providing extensive vim mode - if you're not using VS you don't know what's already possible.