According to the release notes, you can update to Corral and roll back to 9.10 v...

		rustynails on March 15, 2017 \| parent \| context \| favorite \| on: Introducing FreeNAS Corral According to the release notes, you can update to Corral and roll back to 9.10 via the GUI. The system requirements are still 8gb RAM and 8gb disk minimum. There are no details of the performance. Release notes are here. https://download.freenas.org/Corral/RELEASE/ReleaseNotes.txt