[hudon]

GutHub, Shopify, Coinbase, Square, AirBnB, etc. , can probably answer some of your concerns.

[tcoff91]

GitHub feels super slow so I can't say I'm all that surprised to hear it's a rails app.

[montblanc]

Gitlab is also Rails :) But wait it's probably super slow. You should try Jira heard it was wriiten in Java. Must be a fast app then.