Replicating page with many siblings takes a long time
Replicating a page takes a long time.
The page is in author and has many sibling pages at the same level.
Instead of having all sibling pages on one single level, create sublevels and distribute the pages accordingly. Having around 100 pages is acceptable in a single level.
The sibling order feature takes a long time if lots of siblings present at the same level. Having many siblings is not recommended in Communiqué and CRX.