Running patched vanilla on a 2.8GHZ, 1G ram & 256 Video card..
When I first started playing SH III, I loaded the GW mod.. Unbeliveable difference in graphics and immersion..
But (Had to be one), when there was a lot of graphics to deal with (Harbor, convoy, weather, etc), my frame rate (Ctrl & F8) would drop to 3 or 1.. Totally unusable unless you don't mind a 5 second lag between mouse movements.. I reduced particle size & unchecked some other things like sea floor texture, but it was still sloooow.. I ended up wiping the game off & reinstalling a patched vanilla version..
What I should have done was to upgrade my video driver first.. Just yesterday I DL'd an omega driver (Thanks gizzmoe for that suggestion) and regularly have frame rates of 150+... Slows down in harbor to around 40, but still usuable..
Now thinking about reloading GW again