Whenever I move a clip in the timeline I have to wait a really long time for the image to show up in the preview monitor after pressing play. Audio starts ok but I see a black screen for a long time (varies from aprox. 2 to 30 seconds).
This is a bit annoying as it disrupts the editing flow and really slows down the workflow.
I'm cutting a Red Epic sequence on an 2011 iMac with 16 gb of ram. I never got this behaviour in CS5.
Works fine for me in Windows 7, even using an oddball clip downloaded from the Internet.
Yeah, I'm pretty sure it must be either something I'm doing wrong or a problem with my setup. I'll keep investigating.
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Also, to isolate the problem, try using some other media, not the Epic footage.