1) It could be rewritten to passes, so buildReferences (which are most likely to skip build) are run in multiCall ~~2) buildReferences's SQL has performance problems (LIMIT causes pg to use ultraslow plan)~~ 3) It could be threaded
SQL performance moved to #1674
Metadata Update from @tkopecek: - Custom field Size adjusted to None
Commit c4a6f7da fixes this issue
This issue has been migrated to Fedora Forge: https://forge.fedoraproject.org/koji/koji/issues/1671
Please continue any further discussion there.