I recently started watching a bit of content on Prime Video using my Roku TV and found the buffering and scrub (FF/RW/seek) performance to be atrocious. This is in spite of the fact that my device has a hardwired gigabit Ethernet connection, a 900/20 Mbit internet connection through Comcast, and good to excellent Bufferbloat numbers. I'd initially chalked it up to the Roku implementation and the fact that I, like many of the people here, tend to be pretty sensitive to poor UX but over the holidays totally unprompted my father-in-law mentioned that he can't stand watching content on Prime Video using either his Roku or his Android TV devices because the buffering is so terrible (one wired, one wifi, both via Ziply gigabit fiber).

This is in stark contrast to the buttery smooth performance I see when using Netflix, hell, even YouTube bests Prime. Netflix even degrades gracefully when encountering network contention. I know Netflix has been around a lot longer but it's not like Amazon is some type of startup trying its best with the the few engineers it can afford.