Now that QuickAssist acceleration is supported on FreeBSD, it would be really nice to have the drivers compiled into TrueNAS.
01.org
Offloading of ZFS gzip compression and sha256 checksums significantly improve performance and reduce CPU utilization.
github.com
Most of the newer Atom and Xeon-D processors have this support built-in.

Overview of Intel® QuickAssist Technology (Intel® QAT)
Find drivers and patches to assist application developers.
Offloading of ZFS gzip compression and sha256 checksums significantly improve performance and reduce CPU utilization.
GZIP compression offloading with QAT accelerator by wli5 · Pull Request #5846 · openzfs/zfs
This patch implement the hardware accelerator method in GZIP compression in ZFS. When the ZFS pool is enabled GZIP compression, the compression API will be automatically transferred to the hardware...

Most of the newer Atom and Xeon-D processors have this support built-in.