In my case I was quickly hitting limitations of Heroku, and the allocated resources. That said, you could hit the same (higher) limitations even if you're not u

In my case I was quickly hitting limitations of Heroku, and the allocated resources. That said, you could hit the same (higher) limitations even if you're not using Heroku, and even if you're using physical servers. My primary issues were: - Lack of insight into CPU/IO/Memory usage - Should have been able to handle much higher concurrency than I was - Should have been able to perform much better than I was