Q: Compressor 4.2 Retina 13" Performance

Hellow to every body!!

I am using Compressor 4.2 on a late 2014 MacBook Pro Retina 13".

It claims that uses GPU acceleration and the time elapsed for movie cuts around 1,5 and 2 hours is I think, too much, a half of movie duration.

It seems too that uses CPU prior than GPU.

Any suggest ??

Thanks a lot.