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I've been having extremely long file opening and plot times for some projects at my company that we use AutoCAD Civil 3D 2013 on (three projects in particular). My computer specs are above the recommended specs for AutoCAD so I know my computer is not the issue. All files are opened and saved on a local server. The times range from 10 to 20 minutes per file, depending on the project. Some brief descriptions of the file management for each project: Project 1: About 20 xrefs per file, -pu regapps performed on all xrefs (most from other firms), no data references used. Project 2: About 30-40 xrefs per file, -pu regapps & audit performed on all xrefs (most from other firms), no data references used, some other settings used to help improve performance (indexctl=3, demandload=3, xloadctl=2, treedepth=32767, treemax=10000000). Note that many xrefs originate from dgn. Project 3: About 30 xrefs per file, -pu regapps & audit performed on all xrefs (most from other firms), data references ARE used, some other settings used to help improve performance (indexctl=3, demandload=3, xloadctl=2, treedepth=32767, treemax=10000000). Note the xrefs are dwg files that we used DGNIMPORT to import linework from dgn files. Project 1 has the longest wait times averaging around 15-20 minutes per file. Project 2 and 3 have similar wait times around 10-15 minutes per file. Are there any settings I could change to improve the opening times on these files? Any settings I can use for the Sheet Set Manager to keep common xrefs open between the sheets it's trying to plot? Also, when saving xrefs after purging regapps for Projects 1 and 2, file size can jump from Any and all help is appreciated! Thanks for reading.