No, I wasn't using much Heroku-specific. All of my apps run in Docker containers, so it's mostly just migrating my CI to deploy to Fly instead of Heroku.

I did get a lot of perf increases moving from GCP to Fly, but I think I have to credit most of the improvements to SQLite being faster than Firestore:

https://mtlynch.io/retrospectives/2021/12/#migrating-my-side...

wow it def does lol