Recently an AutoCAD Plant 3D 2013 customer reported a longer delay that expected when accessing his Plant 3D project via an offsite VPN connection.
What may have caused the delay when he first connected by the VPN was that the Persistent Local Data Cache (PLDC) was rebuilding as soon as the project was opened.
This is done primarily to improve performance of the application in areas where the data is not expected to change frequently. When accessing a fairly large project the first time, that may take some time for several hundred megabytes of data to be copied across to the local cache.
After completing a project, or when importing a new project into the same folder, you should also purge the cache to free up disk space and to clear out unneeded or irrelevant data from the previous project.
This tool is installed on your system when either AutoCAD Plant 3D or AutoCAD P&ID are installed and is located in the program root folder shown here:
C:\Program Files\Autodesk\AutoCAD Plant 3D 2013 - English\PnPLocalDataCachePurger.exe
You will need to close all AutoCAD versions before running the purge utility.
The PnPLocalDataCachePurger.exe, purges the local cache, so that you can release disk space used by completed projects. Purging the local data cache will not delete, remove, or corrupt your projects; the cache will rebuild again as soon as each project is opened.
For more information on this utility, see Mangesh Kalbhor's blog