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Danny is right. You can't geolocate a site to a continent. Goelocation assumes you're targeting a country or language. I wouldn't bother with a site.asia domain either if all you're worried about is latency. Instead, what I would do is work on geolocating your site. For instance, Amazon offers geolocation in their Route 53 product (country or latency). So you could host your site in the US and a copy in one of their Asian datacenters. This way, your visitors (and robots) will always go to site.com, but be served the fastest instance of your site. This avoids the duplicate content problem entirely. There are some other services and hosting out there that could probably help you do this as well.

Implementing those right away, hope it will work