Glad to know I'm not the only one experiencing this! VSCode+Vim has been driving me insane lately with the excruciating typing lag.
I've never learned vim proper (started with Atom and vim-mode-plus), but I keep thinking it might be time to dive in.
Try Neovim, you'll love it. https://neovim.io/
Funny this comes up today because I was thinking of getting back to vim fully instead of VSCode+vim extension and used vscode as a debugger only (love the UI!).