Where excactly in the scenery do you experience that, DVJ?
On FSX or P3D?

I have a system inferior to yours (i7 @ 4GHz, Nvidia GTX 660) and don't see this anywhere, even under adverse conditions (clouds and rain).

As for ships, David Wilson Okomura made a nice AI traffic package for the Solomons (AVSIM et al).

Cheers,
Mark