Camera is taking a lot of time in refining picture.
4 seconds for regular photo and 15 seconds for night mode photo.
In one ui 2.5, it was almost instant.
Otherwise, its taking good night mode pictures since one ui 3.1
P.S. - NOW SAMSUNG BOTS WILL BARK IN THE COMMENTS BELOW TO WIPE CACHE PARTITION AND CLEAR CAMERA APP DATA.
P.P.S - IT DOESN'T WORK, NEVER HAVE, NEVER WILL