I also went to Heroku. Icing on the cake was when I discovered that even on Heroku's free plan, we were getting significantly better performance than on Zeit's

I also went to Heroku. Icing on the cake was when I discovered that even on Heroku's free plan, we were getting significantly better performance than on Zeit's paid plan. Response times were more stable and had far less latency. Made me really happy and almost made it worth the frustration of having to migrate in the first place. Almost. Heroku has definitely improved over the years.