FreeNAS released an update to 11.1, and it’s a significant change in performance. I am just speaking from my personal experience – however, it’s apparent the new beta UI is way more responsive. Easier to navigate and a selection of color schemes for their new UI makes it feel like you’re actually using software and not filling out a tax form.
The downside is there is no apparent way to save the beta UI settings; meaning every time you log in to the web terminal you will have to change your settings back to how you want them.