Get Water Configurator here on the Vee. It does wonders on your water,which can be adjusted accordingly to your likes, and is easy on frame rates.
Look under FSX Utilities Page 1, 6th item down.
Hope this helps.

I have a lower spec computer, and as much as Id like it to.... FSWC did nothing for me. Not the fault of FSWC... its my comp. Cant handle the nice textures and reflections.
I have found that alot of the photoreal scenery, like what can be found at
www.blueskyscenery.com is quite friendly with framerates, I guess because it eliminates the autogen. The free demo's from FTX are also very good looking, and nice on framerates for me too.
My specs... A hard drive, motherboard, graphics card, some memory, a keyboard, mouse, and monitor - in other words, nothing special.
My Posky