Mirrors WORK IN PROGRESS
Hi all, we are working on mirrors reflections.
This is to make them look great and more recognizable in the right panel (try to search for mirrors and you'll see already many of those fixed).
This is causing some problem on the actual preview window and HQ render (as you may have noticed already) as the tool needs to adjust to the enhanced quality of reflections. But of course we are working on it :)
Please bear with us while we make the improvements.
We will keep you posted.