Once upon a time I mirrored Project Gutenberg. As this was a pain having only 64kbit over ISDN, I was expecting great things from attending a LAN party where we actually had Ethernet speed connection to the internet.
When I started my mirroring script, though, it was not faster than at home. Turned out that the mirror host limited connections to clients in unknown networks to 64kbit.
Luckily I found another mirror host that had no such limits.