After upgrading to DP 5, I see app switching has become very sluggish. Whenever I switch apps (doesn't matter if it's via keyboard or by clicking a window), it takes good 5 - 10 seconds before the app becomes active. This happens every time. When that happens, I also see the spinning beachball.
Is anyone else seeing this? Curious.
This happened to me when I tried installing the first beta over my existing installation. I had to do a complete reinstall.