Buzz!
Looks like the effects are speeding up to the point where it becomes really buggy after a while (if the tab is open in the browser)
Tried to solve by "Browser->On resumed->Turn off effect for object->Wait ~0.2sec->Turn the effect on back again.
This was made in order to reset the effect so it could show up normally again when the user switches back to the tab after a long time.
Sadly, it didn't work.
Also tried Browser->On resumed->Destroy object->Wait ~0.1sec->Create object in the same place again. This was also made in order to reset the object's effects but it didn't work as well.
***It also affects 1 more effect in the same manner called "Plasma Rainbow" by "Gameswarp".
i guess it could be the case for all of the WebGL effects in Construct2, not only water. So it becomes more important then.
Anyone's Solution or fix from 
Scirra would be great! 
Ashley, 
zenox98