Despite the current performance issue there are some great improvements with FM12. One thing that I really appreciate is that portal scrolling works great now on both Windows and Mac. You no longer have to click on a portal to give it focus. Simply hovering over them and scrolling your mouse wheel now works.

Also, with some minor editing to a theme file you can also completely hide the scroll bar while maintaining it's ability to scroll with the mouse wheel. This is different than disabling it in the dialog options which prevent you from scrolling with the mouse wheel.