Ported from internal issue MSFT: 21185335

When using Vim or Neovim in WSL, cursor movement appears much slower in Terminal than in vanilla wsl.exe.
I've attached a few screen recordings of me moving the cursor vertically in Vim and Neovim in both vanilla wsl.exe and WSL in Terminal.

Two Vim options I have enabled that I've noticed significantly exacerbate the issue are cursorcolumn and cursorline, but it is still noticeably slower even with them disabled.

WSL Version: Ubuntu 16.04.5 LTS
Vim Version: 8.1.1-744
Neovim Version: 0.4.0

@nathpete-msft, can you re-attach the recordings here if you can still see this?