I've never had a problem with harbor traffic and large convoys in GWX, even on my old setup that used a 2.4Ghz Single Core Athlon, KT4V Chipset Mobo, 2GB DDR266 RAM, and my Radeon X1650 Pro AGP video card that I've grown so fond of.
As a matter of fact, I switched to ATI from nVidia because of the particle bug in SH3 that plagues nVidia users. My SH3 runs much more smoothly as a result.
Large particle effects, like a tanker exploding, do sometimes cause minor lag but only because I like to use the external camera to zoom in and watch my kills as they go to the bottom.
I think having what was once considered a beefy video card helps a lot. 512MB of video RAM is still nothing to sneeze at, especially with older games, but I've heard that many newer games recommend a vid card with 1GB (!) of RAM and even 2GB is beginning to become the standard.
I'll let you know how things turn out with your mod, PT. Right now, I'm still busy getting all my software and games reinstalled and configured.
15-20 FPS may be playable, but it's no fun having jerky video. I'm hoping I'll still have decent framerates with your mod.
It's going to be an all-day project just to set up GWX 2.1 and make sure all the mods I love don't conflict with anything else.
