In my testing for bugs, I never experienced any real performance issues with the mod. The IP check is , at least for right now, the only check that does SQL queries, and the light check only does 2. There are about 4 or 5 more done when the check is set to full but I still didn't experience many problems with it. Of course, my test boards only have a few members lol, but since the IP check only occurs during registration, I don't think it would cause too many problems for a big board. The cookie check happens every login but it doesn't query the database, it only checks for a cookie on the user's system, so that shouldn't cause any performance hits. Of course, if you test it, any feedback would be very helpful. Also, I'm working on an ACP module for the mod, but it's a slow go for me as the module isn't performing queries correctly for me.