Couldn't the same thing be achieved by routing e.g. google.com/static/ to a separate simple webserver, instead of using another domain? Or use a subdomain, e.g. static.google.com.
The current way seems like needless DNS spam to me...
The current way seems like needless DNS spam to me...
Given that generally people have slower upload than download, shaving off a few bytes from requests is worth it.
I also recall that browsers [used to (?)] limit concurrent requests per domain which this helps work around