That's funny, I've always had the same experience with Vine--website always took a long time to load, then videos would hiccup a lot, if they loaded at all.
No, I'm talking about Vine. They use Flask, and if they are not going to use the codebase any longer...
Personally I like having a big codebase as an architectural reference when I'm trying to learn a new framework. The Patreon source code (Flask too) is public, by the way.