I just downloaded and installed the 1.11 patch, and GalCiv2's performance dropped considerably. Before applying the patch (from a clean install of GalCiv2 1.0), the game ran very smoothly. Now its very choppy. I had 4x anti-aliasing enabled (before applying the patch), but turning it off after applying the path did little good.
System Stats:
Athlon XP 2600+
MSI Geforce 6600 GT 128mb (91.28 Forceware drivers)
Soundblaster Audigy 2 ZS
1gb RAM