I'm using MPEG streamclip to re-encode several batches of videos, and there are so many to encode that I'm using 2 Macs at the same time. Oddly, 1 computer is significantly faster than the other. Take a look at the 2 Macs I'm using: #1 is a MacBook 1,1, 1.83GHz Core Duo, 2 GB RAM, 320GB @7200rpm, OSX 10.6.3, MPEG streamclip version 1.9.3b3 #2 is a MacBook Pro 1,1 2.16GHz Core Duo, 2 GB RAM, 500GB @7200rpm, OSX 10.6.3, MPEG streamclip version 1.9.3b3 The encodes are of xvid avi to AIC mov. A client gave me some helmet cam footage to edit together with some 1080i, 720p, and Standard def stuff. Nothing else is running on either machine. >>>The MacBook encodes the same videos at ~1.59 Mbps while the MacBook Pro does it at ~1.13 Mbps. >>>Why does the MB work faster than the MBP? Thanks for taking a look into this!