Good work, I really enjoyed it Must admit I agree about the water though, it does seem a bit off compered to other surroundings.
As for fps, it never dropped below 170 & in 80% of the time it was somewhere between 300/500. My confa is: Intel Core i5-750 (2.66Ghz), ATI Radeon HD5750 1GB, 4GB DDR3 1333Mhz Kingston.
Must admit I agree about the water though, it does seem a bit off compered to other surroundings. 