That would most likely be because of low latency and jitter. The app is in essentially the environment it was developed in and does not have to put effort into correcting errors that itself cause pauses in the visible video, since it tries to hide the parts where artefacts appear.

Ten years back I was told America likes to zap quickly through tv-channels with all the artefacts involved while Asia preferred a slower and artefact-free experience. Analog and keyframeless digital codecs are faster but not so bandwidth efficient.

I'd be curious to know how much bandwidth it utilises when that much is available.