Hi All, I am testing delta-syncrepl using OpenLDAP 2.3.43.7(actually as ZimbraLDAP on ZCS 5.0.16). Please let us know if you need more information.
You should be working with Zimbra Support to address your issues. But I would note you fail to detail any BDB configuration, which is where the bottleneck is likely to be.
--Quanah -- Quanah Gibson-Mount Principal Software Engineer Zimbra, Inc -------------------- Zimbra :: the leader in open source messaging and collaboration