Does this configuration have impact in performance?

[nfn]

Hello,

I have two small bits in my configuration that I'm worried about.
One it to redirect users based in their country to a specific page.
The other is to choose the upstream based in a cookie.

'm am worried about performance and would like to know if this small
bits are evil to my site.

================================
### Map Member ID Cookie

map  $cookie_memberid  $prxy  {
  default        upstream-1;
  ~^[1-9]\d*$    upstream-2;
}
### / Map Member ID Cookie

### Map Country Code
map "$geoip_country_code.$arg_section" $registo {
    default 0;
    AAA.register 1;
    BBB.register 1;
}

map "$geoip_country_code.$arg_serviceClick" $registo {
    default 0;
    AAA.facebook 1;
    BBB.facebook 1;
}
### / Map Country Code

server {

        # Main location
        location / {

            # GeoIP
            if ($registo) {
                return 301 /pages/registo;
            }

            proxy_pass  http://$prxy;
}
==============================

Thanks

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,219466,219466#msg-219466