since months Spotify on my Mac El Capitan (10.11.6) gets slower and slower. It needs maybe up to ten minutes to see not a black screen only.
But also when playlists are loaded after such long time, normally it is not possible to start any list or it needs up to 5 minutes for listening to music.
I also tried to clear cache and to reinstall Spotify, but there is the same problem always.
Thats very frustrating.