This guide is focused on Civil 3d projects that have become very slow. It is assumed that other troubleshooting steps have been checked.
Link to: Troubleshooting Civil 3d Performance Issues In ProjectWise Due to Errors
This document is written to help identify issues that can be resolved to help return the project to acceptable performance.
Remediation of the data should be done by a project participant that is familiar with the data being repaired.