Recently my company started utilizing the pipe network feature in Autocad Civil 3d. We are continually having issues with slow performance with any base file that contains a pipe network and any layout sheets that have the pipe network XREF in. It is taking several minutes to copy, save, open, and print any of these files. Whenever you try one of these commands the task bar says "Scanning the drawing" and will then freeze for minutes. In the design base file is a XREF of the land plan and a data shortcut for the surface of the area along with the proposed pipe network. We normally have two networks one for sanitary and one for sewer. Each of these networks could be roughly 2,000 LF or less. Can anyone think of any reason as to why these files are so slow?