very slow export to QT from XDCAM EX timeline

I have a one hour XDCAM EX program that I'm exporting to a self contained QT movie. The dialog box tells me it's going to take 8 hours. In the past this same process normally takes less than an hour. Any ideas what the problem may be?

Dual quad core Mac Pro/10 gigs ram/Video drive is apple raid (is a little full)/ Kona 3 card. FCS-2

Thx for any suggestions...jw
 
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