Camera is taking a lot of time refining pictures.
4 seconds for regular photo and 15 seconds for Night mode photo.
In one ui 2.5, it was almost instant.
But otherwise, night mode is taking good pictures in 3.1
P.S. - NOW SAMSUNG BOTS WILL BARK IN THE COMMENTS BELOW TO WIPE CACHE PARTITION AND CLEAR APP DATA.
P.P.S - IT NEVER WORKS, NEVER HAVE, NEVER WILL.