I'm having the same issues with super slow output on CC.
I had a speedgrade round-trip file that I brought back in PremPro CC with color grading applied. Output dialog box (Media Encoder CC) said it would take 60+ hours to output a 2 hour clip with ProRes (LT). So, thinking it must be speedgrade interface, I did a test with a very short and simplified piece and no speedgrade involved, only fast color corrector as filter. The 5 minutes took 1.5 hours to output as ProRes (LT).
Then I opened the same project in Premiere Pro CS6 the same 5 minutes - exactly the same in every way - took less than 10 minutes to output as ProRes (LT). There is definitely something wrong with CC...
I'm on a MacBookPro 2.3 GHz Intel Core i7, 8GB RAM, OSX 10.7.5
Hi mjgmacromedia,
Please check the forum link mentioned below and check if the problem gets resolved using the steps provided. Also, please mention the make and model Graphics card installed on your machine.
http://forums.adobe.com/message/6265065#6265065
Regards,
Vinay