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tl;dr Don't run your single-threaded Rails app (read: the vast majority of Rails apps) on Heroku. Neither the Cedar or Bamboo stacks are optimized for them at this point.

It's incredible to me how the performance of their stack has degraded so far for what is probably the most common use case for their platform.

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I think that's partly an insensitivity driven by Rails itself. Ruby and Rails have many good features, but speed is not one of them. Spending time working with Rails definitely wore down my previously high standards for page speed.

Given that their metrics hid the problem, I could see most shops saying, "Well, the stats are fast, so the occasional slow page we see must be a fluke."

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