I'm still having an issue with frame rate drops when using certain wallpapers. I wish they'd fix that.
Specifically opening and closing apps is stuttery when using certain wallpapers. I even tried the built in Apple wallpapers and it does the same thing. However, there are other wallpapers that don't make the animations stutter at all, so I just use one of those.
The following wallpapers make Mail, Safari and Messages stutter when opening them, and almost every app stutters while closing:
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However, the following wallpapers make opening and closing apps smooth always:
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