Water lag?

Whenever I’m looking at water, even if I can’t see it, just in the general direction, I lag extremely bad (worse than the tool gun, btw) and it’s just horribly annoying, especially on something like Zombie Survival where the maps change, and every other map has even a small pool of water. I really need a fix. Any other one doesn’t change it, although one let me go underwater. None of them has fixed my lag problem.

Weird… what’s your specs?