There is a animated water lagg on both, the Samsung Galaxy Tab S and Tab S2. The game can be played with best settings, but not with animated water. The same on the S6.
Once you turn animated water on, the frames drop down really far. It's unplayable. I'd love to see this fixed.
This bug is since 0.10.0, on 0.9.0 it wasn't.
If you did not already, please remember to perform a search before creating a ticket to see if your bug hasn't already been reported. This issue was reported previously as MCPE-7858. Comment your experience there!