I get a few seconds delay intermittently when playing or skipping a song (even ones downloaded). This functionality works perfectly in the native music app or the control centre widget. Even the "Adding Content To Apple Music" sample code app is very laggy. This bug needs to fixed because it makes users think the app is frozen, thus ruining the app user experience.
Please submit your own bug reports to apple if you are having this problem so we can get this issue resolved faster!