Developers should avoid running stateful sessions on Heroku dynos without externalising session storage to Redis because dynos restart frequently and do not share memory state. Avoid relying on the free or eco dyno tier for production applications, as cold start delays can significantly impact user experience. At scales exceeding $500/month on Heroku, consider evaluating AWS, GCP, or Render as cost-effective alternatives, since Heroku's pricing becomes considerably higher than comparable managed cloud infrastructure at medium scale.
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