Indesign version: 16.1
Steps to reproduce: Insert new cross reference
Expected result: New Cross-Reference panel should load within an acceptable delay
Actual Result: New Cross-Reference pane takes extremely long time to load.

To add a new cross reference takes about 20 minutes for the panel to load, while editing an existing cross reference is normal. The issue is common to many documents.

I tried to go back to versions 16.0 and 16.01, but had the same issue.

I have used this feature in the past and every thing was normal.