Ric, what are your specs.
I've got a P4 2.4Ghz, running 512MB RAM under XP. I've also got a nVidia GeForce 4 4600Ti graphics card.
I wouldn't say lomac ran really well, but it's easily playable. I'm running it at 1280x1024 with 4xaa and 8xansio.
From what I can gather, it's the clouds that kill the frames.
Ric B.