Win7 Imagex slow image apply times

I have been working on transitioning our company over to using ImageX to create and deploy images, however we recently ran into a snag. When we tested out the process on our Dell E6440 laptops, it took anywhere form 40 to 70 min to apply the image. The WIM file is around 11 GB, so there is absolutely no reason is should take this long. We have since tried imaging on several other models, and...