I downloaded a 50 MB CSV file full of russian tweets from NBC [1] in response to your challenge and VSCode opened it nearly instantly (~2 seconds) on my self-built Windows 10 PC with an i5-4690 CPU @ 3.50 GHz with 2 other instances of VSCode already running.

Total memory usage for VSCode processes was 1.5 GB. The other 2 instances of VSCode were debugging a Node.js Express app and editing a rather large React/Redux app.

When VSCode had no other running instances, opening the same file took about .5 seconds longer.

[1] https://www.nbcnews.com/tech/social-media/now-available-more...

Works fine. VSCode also works fine opening 500mb files. Atom still crashes for me tho.