I have searched and got some conflicting information, but here's the situation: My late 2009 iMac is great, but slow. My brand new macbook pro retina (fully loaded 15") is blazing fast, but I am used to working on a large display when editing. I just ordered the mini displayport to mini displayport cable, and just wanted to know the protocol to make it work most effectively or if there is an issue if I have 10.7.5 on the iMac vs Mavericks on the rMBP. Just want to know if it compatibility and/or latency will be an issue? Thank you!