Edited
The problem is happening to more than one user. They followed the instructions here with no noticeable improvement: http://blog.plasticscm.com/2018/05/debugging-pending-changes-view-performance.html
The logs for the particular user that raised the request:
2020-11-27 10:58:12,228 <OMITTED> DEBUG WorkspaceStatus: DiskChangesSearcher - -------ProcessChanges:--------
2020-11-27 10:58:12,228 <OMITTED> DEBUG WorkspaceStatus: DiskChangesSearcher - timerGetMountPoint 30 ms, 223988 times
2020-11-27 10:58:12,228 <OMITTED> DEBUG WorkspaceStatus: DiskChangesSearcher - timerProcessChange 62 ms, 223988 times
2020-11-27 10:58:12,228 <OMITTED> DEBUG WorkspaceStatus: DiskChangesSearcher - timerIsBinaryPath 0 ms, 0 times
2020-11-27 10:58:12,228 <OMITTED> DEBUG WorkspaceStatus: DiskChangesSearcher - timerIsBinaryTypePredictor 0 ms, 0 times
2020-11-27 10:58:12,228 <OMITTED> DEBUG WorkspaceStatus: DiskChangesSearcher - timerGetChangeTypes 295 ms, 223988 times
2020-11-27 10:58:12,229 <OMITTED> DEBUG WorkspaceStatus: DiskChangesSearcher - timerGetIgnoredTypes 16 ms, 2926 times
2020-11-27 10:58:12,229 <OMITTED> DEBUG WorkspaceStatus: DiskChangesSearcher - timerGetCloakedTypes 32 ms, 223988 times
2020-11-27 10:58:12,229 <OMITTED> DEBUG WorkspaceStatus: DiskChangesSearcher - timerCheckChanged 63 ms, 196851 times
2020-11-27 10:58:12,229 <OMITTED> DEBUG WorkspaceStatus: DiskChangesSearcher - timerGetHiddenTypes 0 ms, 15 times
2020-11-27 10:58:12,229 <OMITTED> DEBUG WorkspaceStatus: DiskChangesSearcher - timerNeedToProcessChildren 47 ms, 223988 times
2020-11-27 10:58:12,229 <OMITTED> DEBUG WorkspaceStatus: DiskChangesSearcher - timerGetFsNodes 14284 ms, 24211 times
2020-11-27 10:58:12,229 <OMITTED> DEBUG WorkspaceStatus: DiskChangesSearcher - Get changes total time: 15078
Our disk drives are:
WD Black SN750 NVMe 2 SSD WDS (where system and Plastic SCM software resides); and
Adata XPG GAMMIX S11 Pro (where we locate our workspaces).