TrueNAS 11.1-x delivers many performance improvements, new and
updated drivers, new features and enhancements, and bug fixes.

Operating System
TrueNAS 11.1-x is based on the FreeBSD 11.1-STABLE operating system, which
includes numerous performance improvements, new and updated drivers, new
features, and bug fixes.

OpenZFS
OpenZFS has seen many improvements. Users will notice a significant
speedup when listing a large number of snapshots or deleting multiple
snapshots and large files.

The scrub and resilver algorithm implement substantial speed improvements
which will be most noticeable on fragmented pools.

Resilver Priority has been added to Storage. Resilvering, which rebuilds
the storage array, can now be run at a higher priority at configurable
times and days of the week.

IPMI
The Identify Light button has been added to identify a system in a rack
by flashing its Unit ID light.

Services

Samba has been patched to address CVE-2018-1050 and CVE-2018-1057. 

The Netdata real-time performance and monitoring system has been added.

The SNMP MIB has many improvements, including the ability to send SNMP
traps for new alerts.

Time Machine
Support for per-backup OS X Time Machine quotas has been added.

Alerts
The Send Test Alert button has been added to Alert Services, making
testing of notification services simpler.