Update 4/24: New build 1.1.0.2549 seems to be available on the app store with an apology in the app description... I'm still testing it out but many users here report the problem is solved.

Update 4/20: User named Matt Suda (mod?) has posted in this thread to expect an app update this week. No official word.

Update 4/07-ish: Spotify support says they are aware of the problem and "looking into it."

Spotify just upgraded itself to the newest 1.0 version on my iPhone 5 (iOS 7.1). The update renders the app unusably slow. After using it for several hours I had to revert back to the Apple Music app. Things I noticed:

- After augmenting a playlist (deleting a track, for example), the app is unresponsive for ~5 second.

- Clicking "Share" from the new popup menu renders the app unresponsive for ~5 seconds, and then executes several actions all at once.

- The (REV, PLAY, FWD) controls from the lock screen are unresponsive after the first command. Tracks take about 5-10 seconds to switch, and if I keep pressing FWD, for example, the requests seem to be queued, executing over the next minute at random times.

- Scrolling becomes slow / unresponsive. I must wait 5-10 seconds for scrolling in any list to be re-enabled.

Usability-wise I am unimpressed with the new search / discovery feature. I found it difficult to view all albums by a particular artist. I have to search, then scroll down to Albums, and then click on Albums to view all of them. Maybe there were more albums listed in the previous version?

Anyone else having these issues? The app is basically unusable at this stage, so I'm using the built in Apple Music app. Tempted to unsubscribe until the issue is resolved.