About the Progressive Draw Distance (PDD) Stepping feature
There are many in-world items that use gestures to alter a user's draw distance (DD) after teleporting in order to rez in objects that are closest first and objects that are further away later. The inherent problem with these tools is that they cause an additional load on the server. When a user first teleports into a location, the server instantly sends all of that data, but when such a gesture is activated, it causes that data to be lost, and the server has to resend it.
This feature is now built into the viewer, and because it can progressively step the draw distance instantly before the server begins to send the data, it cuts the server load in half in comparison to the in-world gestures. As a result of this improvement, the Phoenix Viewer disables the ability of gestures to trigger the DD command in the spirit of reducing overall lag and increasing region performance for everyone.
To confirm that PDD is in fact active and working: