MongoDB 4.0.16-rc0 is out and is ready for testing. This is a release candidate containing only fixes since 4.0.15. The next stable release 4.0.16 will be a recommended upgrade for all 4.0 users.
Fixed in this release:
4.0 Release Notes
- SERVER-45831 [4.0] Performance regression processing large aggregation commands
As always, please let us know of any issues.
-- The MongoDB Team