Hi.
I'm working with AE CS6, Windows 8, intel Core i7-2600, 8Gb RAM, NVIDIA GeForce GTX 550 Ti (1 GB).
My problem is that I'm rendering a lot of comps in HDTV, the only two effects applied to each clip in are Selective Color and Keylight. When I start the queue, takes about 20 minutes to render one clip, then 1 hour for the second one, then 3 hours for the third one, then EIGHT HOURS for the fourth one. For comps of the same duration and effects (about to 4 minutes each comp).
If I stop the queue and restart my computer, render takes again 20 minutes, 1 hour, and so on.
I've try to clean system cache, copy files to an internal hard disk (before I was working with an USB hardisk), simplify the adresses. But I still don't know what to do.
I have to render close to 50 comps, if them takes about 8 hours, the render will finish never! I'm desperate. 
THANKS A LOT, and sorry for my poor english. 
Hope you have the answer or the solution...