[RealPlastic]

Apple Music is much slower since they moved to server-side authentication. Every single request has to be sent to the server, authenticated, retrieved, then sent back the end-user. Add a song to playlist sometimes takes a lot longer than expected. Do not add the song a second time while waiting or it will show up on the playlist twice. Songs stop playing for no apparent reason - I suspect its due to your session needing to be authenticated quite often and this can cause the music to stop. Personal radio station loads X songs, then plays them in a loop until you can be authenticated and make another request for another group of X songs to be played.

As someone with a background in QA, I can only assume they do all their testing under "ideal conditions" so they do not notice the (sometimes frustrating) lag time for end-users.