Slow text input in comment box of large Merge Requests when using Microsoft Edge

Summary

When editing a large MR on using Microsoft Edge, there's a lag between the typing and the letters being rendered in the comment box.

Steps to reproduce

Using the Edge browser, scroll on the way down of the DONTREAD.md file here and start typing in a comment. You'll notice it's very slow.

I was unable to reproduce this on Chrome. It was reasonable.

Example Project

OK_MF/gitlab-dummy!1 (diffs)

What is the current bug behavior?

(What actually happens)

What is the expected correct behavior?

Typing performance should be on-par with other browsers.