How Thingworx Connection Sever connect with Platform on Web Socket

We have connected around 20000 device with connection server we can see number of connections on connection server ( using netstat) but we cannot see same amount of connection on Platform.

How we can check this same on platform specially on WSS ( Web Socket) 

Look like we can see multiple thread on connection server (Based on connected agents) but this is transferring data on platform in single thread?

Please suggest