This only functions during registration; not during normal forum use (like htaccess would). So I can't imagine any performance penalty.
I'm using it and it works exactly like it should. If the IP address is not from a specifically allowed country, the user ends up in the "Awaiting COPPA moderation" group and cannot post. They are still visible, so profile spam is still there, but that doesn't bother me as much as posted spam.
|