Performance issues when restoring 30k resources at the first time

Description of problem:

Following the bug: https://issues.redhat.com/browse/OADP-1167

While restoring the first time (without existing-resource-policy: update flag) - the time is 55min - double from OADP 1.1.0 results. - it is a regression bug

while restoring the 2nd & 3rd time with existing-resource-policy: update flag - the time is 28min - half from OADP 1.1.0 results.

See https://issues.redhat.com/browse/OADP-1167?focusedId=21683376&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-21683376)

Version-Release number of selected component (if applicable):

OCP 4.12.9

ODF 4.12.9-rhodf
OADP 1.3.0-138

How reproducible:

Steps to Reproduce:
1. Create namespace with 33K secerts
2.  Run backup
3. Delete the namespace
4. run 1st restore

5. run a few restores with existing-resource-policy: update flag

Actual results:

first restore completed OK but the duration is double from OADP 1.1.0 results 

Expected results:

first restore complete OK with at least the same duration as OADP 1.1.0 results

Additional info: