I cancelled my subscription after the player regularly stopped emitting sound - the player would show it's playing a song and increment the progress bar but no sound was coming out. I have never had the same problem with any other player. Oh and sometimes any song would just keep buffering until I restarted the app.

As far as the slowness goes, I attribute that to the fact that the app is not native, it's just some sort of Electron-like mess. Then again so is Spotify (I think?) and it feels much snappier.