I know FCP rocks the XDCAM EX codec for editing, but I’ve always kept my render presets set to ProRes. The render times are short. I’m on an 8-core Mac Pro, but we edit this stuff on a MacBook Pro (first Intel edition) on the road without issue.
I use AE all the time and have had no performance problems with XDCAM EX footage. That’s for simple motion, color correction, stabilization, the works. It seems to be pretty efficient.
Cf