Since about 1 month mirror selection stopped to use my mirror for downloading updates (all servers are in the single AS).

The selector uses mirror from USA which are very, very slow. I live in Poland and I run public mirror (http://mirror.kielcetechnologypark.net/centos) for CentOS. I'm wondering how the mirror selection works. Can some one explain it to me ?

Pozdrawiam / Best Regards
Sebastian Sala