Mongrel 1.0.1 + Rails 1.1.6 + Ruby 1.8.5

Try to deploy the application in FreeBSD with the combination mentioned, amazingly.... SLOW.... I don't know what's wrong with it, the Mongrel cluster making the system overhead when process only one single simple request, what's wrong with the latest version?? I switch back to Mongrel previous stable version, it performing very good.