Samba 4.11 Released With Much Better Scalability While Disabling SMB1 By Default
Perhaps most exciting is Samba 4.11 having big scalability improvements to the point that it should be able to scale to 100,000+ users.
Some of the other big changes in Samba 4.11 are changing the default process model to prefork, samba-tool enhancements, performance improvements for join and reindex operations, better LDB search performance, and CephFS snapshot integration.
Breaking changes in Samba 4.11 are now requiring Python 3 (in place of Python 2 support) and the SMB1 protocol support is now disabled by default. The client/server minimum protocol versions have been bumped to SMB2_02 by default with SMB1 support being officially deprecated and to be gutted out in the future.
More details on Samba 4.11 via the release notes on Samba.org.