Not sure exactly when, but my iMac spotify install got pretty much unusable -- the load time is, and I'm not exaggerating, 9-10 minutes. If I were to wait that long, the performance once everything loads is OK. It's strictly the load. On my iphone X (latest OS) load time is fine. On my Macbook Pro (recent acquisition), same OS as desktop (High Sierra 10.13.6), load time is fine.
What can I do to restore the load time on my iMac -- my wife usually is curled up with the Macbook Pro! Help!
(And for chrisake spotify, put a friggin' A-Z on the right side of the library on the deskop version - sheesh.)