Performance is very slow when working with an assembly drawing when attempting to add/move/delete/copy/paste components or views.
1. Review the NX syslog, found under File ->Help->Log file, for multiple entries of the following:
"PSM Validation Report---------"
2. The "PSM Validation" messages are caused by having a Parts List in the file that is from an earlier version and is possibly corrupted.
3. This issue can usually be resolved by updating the parts list using Menu-> Tools-> "Version up" and selecting the Parts List or by recreating it completely.