I use my H3DII-39 files, before on my 17" MBP [2008] that is not working now, and my new 13" MBP, and my Mac Mini, all fine, i don't see much slow unless it is very slow to you, for me coming from PC to Mac [i did move to Mac since 2008] i can see the difference. We will see what it will be with H4D-60