Hey Dzibarik, The performance options shows only when in painting mode or the dynamask editor, it's used to control undo levels when painting. 3DO is 1:1 with Unity 5.3, so using the export preset for Unity 5 on the base creator, will be represented as 1:1 with Unity 5. I hope this helps! :)
I've read that there is a dropdown menu for perfomance options at the top right of 3DO window. Here is how it looks in my 3DO: I see no perfomance options there. Also I don't know how to turn on Unity 5 viewport so I could match roughness. any tips?