The Shanghai site is being a bit “temperamental” . WebPagetest automatically hides locations that haven’t connected in the last hour and takes them offline until they start connecting again. I just sent a note to the Fastsoft team to see if they can look into it because I can’t even ping the machine right now so it seems to be down hard.
DNS in China is an interesting thing. Most of the providers end up using public DNS servers instead of their own (though I did manage to get the Jaingsu server to use a local one). When it comes back online I’ll see how the Shainghai one is configured to make sure it is at least using something close by.
CDN’s (particularly Akamai) don’t do so well at localizing traffic that goes to any of the public DNS systems that use distributed anycast servers (Google, Open DNS or the Level 3 servers - even EC2). They usually rely on mapping the IP to a geography based on tables that they maintain and they don’t seem to have a good mapping of the physical servers that power some of the more common public DNS systems. The CDN’s that use anycast on their own DNS servers usually do a better job of putting the traffic close to the user (and the VERY few that use TCP anycast for the actual servers do a MUCH better job because they don’t rely on DNS).