The Spotify desktop client has seen a massive regression since 2008 or 2009. It's incredible how they managed to make it so unresponsive. Scrolling in a playlist is like playing a game at 10 fps. It's uncomfortable and not worth it. Ads are worse as well. I've seen countless malware ads in the bottom banner.
... but (smart?) developer time is so expensive! and computers are so fast!
Developer vs computer time trade-off works only when software already works reasonably well. Which is not the case.