I have read: How do I disable VsHub.exe in the system tray? and https://connect.microsoft.com/VisualStudio/feedback/details/1919828/hundreds-of-calls-second-to-vshub-and-bro
These requests seem to come from the Diagnostic Tools window which runs when debugging. Seems as though they provide the monitoring information for Memory Usage and CPU Usage.
You can stop the requests if you don't care to see the usage information by disabling Memory/CPU monitoring in the Diagnostic Tools dialog box.