For me it was TypeScript. I had terrible slowdowns in vim for whatever reason (was using a couple different plugins, and maybe things have improved since then),

For me it was TypeScript. I had terrible slowdowns in vim for whatever reason (was using a couple different plugins, and maybe things have improved since then), and VSCode is hands down the best TypeScript editor. I then found it to be a nicer experience for JS in general as well as C/C++. I still use vim often but since I'm not a vim power user, the vim emulation mode/plugin for any particular editor is generally good enough for me.