I finally upgraded to 4 from the 3 series after over a year of reminders. It runs slow. And the new interface is less than intuitive, especially the exegesis setup (closing tabs, moving the screens, etc.)
I have a i7 quad-core, 6Gb memor, and 500Gb harddrive. Plenty of speed and power and it is still slow after updates.
Very disappointed. Going back to 3 for now.