Ah yes, the dreaded straight line of water. So you aren't using dandelO's painted shader solution for water? It definitely saves render time.
As I said before, I really like the colours on this one, and the close-up displacements also stand up well, so it's cool that you've shared the file. It makes me think that perhaps we should have a "Surfacing Library" in the File Sharing section, where good solutions for rock, soil and other suface colouring and micro-displacements could be archived for easy access. What say you, Forum admins and other Terrageneers?