vSphere Client Pauses When Selecting Hosts

Issue: When clicking on an ESXi host in the vSphere client, the interface hangs for 5 to 10 seconds.  This behavior occurs in both the traditional and web vSphere client editions. 

Cause: ESX host DNS settings are incorrect.  

Solution: Point host DNS settings on affected hosts to valid DNS servers. For environments without DNS, remove host DNS settings.