Traffic manager is not working as intended with performance mode

Hello,

We established traffic manager on 2 instances one is avaialble in WEU and other in SEA but users from shanghai are still routed to WEU instance instead of SEA instance and facing latency issues. we done some background work as below:

I requested the users in Shanghai to use http://azurespeedtest.azurewebsites.net/  to know the the closest DC.  They see "It looks like your nearest Data Center is West Europe. There appears to be a CDN Node nearer your location". When we use the above site from India, it shows "It looks like your nearest Data Center is Southeast Asia".  My question is:

1. Based on the above lookups, TM seems to be routing correctly even though India is closer to West Europe than Shanghai? 
2. What is the additional information "There appears to be a CDN Node nearer your location" after data center that is displayed when looked up from Shanghai that is not shown from India? Could this "CDN Node" be making the Shanghai users to detect West Europe?

please provide your valueble suggestion ASAP as its spoiling total moto of adapting Traffic manager

Regards

\praveen