How much, I couldn't say... obviously the size of the exe is small, But I'd think the the greatest amount would be to the DC to evaluate group memberships and such or AD queries if you have such in your script would generate the most traffic.
Kix does cache user/group membership info, so if your sites are fairly static, that would eliminate much of that traffic, and if you have a DC at each site, it should eliminate much of the WAN traffic.
