My device: iPad Mini 2 - iOS 9.3.2
Hopefully they've fixed the Night Shift bug where Night Shift mode sometimes remains ON outside of the scheduled window.
Plus when using the search box in Settings to search for Night Shift it doesn't find it!!
My only other bug is with gestures in trying to swipe between apps. Sometimes you have to try swiping a couple of times before it responds.
Lag hasn't been too bad but 9.3.2 is not as snappy as it was when it ran 9.0.1.
So I'm hoping 9.3.3 improves those minor but niggly things.
UPDATE
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Upgraded to 9.3.3 and noticing some definite improvements.
-Swiping from app to app is a little better, smoother, but still a bit of lag there. Sometimes the slow visual transition from app to app doesn't happen so that when you swipe you instantly see the next app.
-Safari tabs - in 9.3.2 when you pinched the tabs to view them all and then tried to swipe one away all it did was move that tab in front of the one next to it. So basically all I could do was rearrange my tabs. Now in 9.3.3 I can swipe away the tabs and rearrange them by holding down a tab and then moving it, which is I guess how it should work and I like how it works this way. Nice!
-Pinching to minimize apps - the transition now seems smooth again, sometimes but not always.
There were some transitions, such as launching a folder that were a little laggy at first but having launched and swiped through a number of things now it all seems much smoother.
And I might add that that is with Reduce Motion set to ON.
With Reduce Motion set to OFF everything seems a little bit smoother but still some slight lag in some places.