Whenever I load a map up that has water in it spring lags horribly, with an fps of about a frame every 4 seconds, and my ping skyrocketing to 1440 (usually). My CPU hovers around 0% and 1%. The first 3 seconds before the game though run smooth. Its just as soon as any units spawn (or game starts) that it breaks down. I have tried three different mods, maps with or without water (being the maps without water work as normal), extremely low settings with windowed mode, maxed out settings at the highest resolution, reinstalling drivers etc.
I have a GF6600 and from what I understand it does work on that card. In fact I know it does, because I see it working, just with extreme lag. I have also reinstalled the newest NVIDIA drivers, to no avail.
I know I can play without dynamic water but I really really want to see it

Also from what I understand the water is entirely reliant on GPU, might that be a problem, could my card totally hate computing dynamic water? Reflective water and other water like that works in all my other games.
It's probably something stupid I forgot =/