The archiving object CHANGDOCU should only be used to archive the change documents of master data.
Change documents of transaction data records should still be archived together with the appropriate archiving object.
Change documents are normally only archived using archiving class CHANGEDOCU together with
application data for which they have been generated.
Archiving is usually resource intensive. Most of the times we have to deal with this and archive data in smaller amounts.
you have mentioned two issues here 1.performance 2.display inconsitency.
based on the dumps, further investigations should be carried out to identify root cause.
or maybe you have already done that
If I were in this situation would reach out to SAP Support.
Regards,
Satya