Verified on 6.9.2 snap 3. On a setup with 100 repos I've seen ~30% improvement of the Complete syncs from Satellite to an external Capsule. Speed of repo syncs to the Satellite itself remained the same, compared to 6.8.6 snap 1.1. Also verified that different content types (rpms, kickstart, files, container images) are synced properly and available to the registered host in a CV promoted to the capsule's LCE. Additional changes (content added/removed) of that CV were synced properly and reflected at the host as well.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Satellite 6.9.2 Async Bug Fix Update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2021:2074