I just got the 13" cMBP with 2.9 i7 this past weekend, so a about a 1 1/2 weeks to decide if i want to return it for the 13" rMBP. I mostly use my laptop for the web, office and java programming in eclipse with the occasional game (Black Ops). My question is how much of a drop off in speed/performance do you think there would be if i switched?