View Currently executing Requests in IIS

Go to InetMgr, go to the worker processes, double click the one you want to monitor.

or you can run following command to have more control

%windir%\system32\inetsrv\appcmd list requests /elapsed:10000

This will show all request which are execugint for more than 10 seconds. 

If you see the new requests are queuing and existing request keep taking more time then you are having a hang. Better to take the dump of the worker process using Debug Diag in such case and then analyze it for the root cause of the hang.