I have an ibook 1GHz with 256MB of memory. I can get FCP 4 and load it onto my system. However, a friend of mine said I need to get at least another 512MB of memory if it is to run at a descent speed. I don't mind spending the extra bucks to buy the memory. I wonder though if FCP 4 will run well on an ibook period. Does anybody here have experience running FCP 4 on a G4 ibook? If so, does the program run at a good speed (five seconds for rendering dissolves), or does it takes several minutes to render one effect? Also, do the sequences play back without having errors and stops because the computer can't catch up? I remember working on an Avid that constantly had video and audio underruns. It was extremely annoying and difficult to deal with. If FCP 4 does the same thing on an ibook, I'll just save up the money to buy a G5 tower.