Redirect Site Based on Country Wise

Hi All,

I am working on Redirection my site ex domain.com to domain.in, domain.uk etc based on IP location i done this part getting visiter ip address and location based on the i am redirection to my site to different url.

my Question is i can achieve this via in global.asax file under Application_BeginRequest or i can write the custom urlrewrite using this IHttpModule, but both the cases what happen each and every page loading this fucntion are keep on calling for example in my aspx page it has .css,.js etc while loading these page it will keep on checking my ip addreess and location this will depends on the third party web services for Getting IPlocations. due to this my page loading is very slow how can avoid this or any different way to achieve this.

Thanks in advance