I recently placed an order for the new Retina Macbook and I chose the 2.6ghz configuration, because I didn't think it was worth an extra $250 for a .1ghz boost in processor speed. However, I didn't realize that there was also a jump in the cache by 2mb and now I am wondering if I should have just upgraded since I am already spending a lot on this machine. How much of a difference does this make? If I reconfigure my order now, I'll have to wait an extra week for shipping. Sorry for the first world problem post. Just hoping someone has some insight on this.