Comment by Jare

I'm still confused: since you're using NodeJS, I imagine your dynos are effectively handling a large amount of concurrent requests. This should in turn negate any impact of long-running requests, since they don't cause further requests to be queued in any way. So, where are requests (or responses) being queued (or lost) in your app? In Rabbit? Are you getting errors and slowness as streaks rather than isolated random events? Could it be due to spinup time of new backend workers, or something along those lines?