A G4 will speed things up quite a bit. I have a Dual 450 G4 with a GIG of RAM and I get pretty good speeds. My problem is that I have also been working to create some VCD's and I have found the quality offered in Toast 5's VCD Export extension for iMovie to produce lousy quality VCD's.
I tried exporting a Full Frame, 29.97fps high quality movie from iMovie and got a 4GIG export for a 21 minute episode of 'The Job". I then used Media Cleaner 5.0.2 to create an MPEG 1 movie for VCD and it took about 12 hours to export it thru Media Cleaner. I wound up with a 220MB movie.
The movie looked great on my computer through QT Player but when I created a VCD using Toast 5 with it it still looked pixelated as hell.
I am very interested in finding out how to produce good quality VCD's since they cost a faction of DVD and hold as much video as iDVD produced movies, about 70 minutes.
Try looking at
www.vcdhelp.com, although there is a lot of information most of it is for Windows uses using Nero to create VCD's.
If anyone knows how to create good VCD's please post it here or create a new thread. I think it would be of great interest to many if us interested in doing this.
By the way, after crunching a 4GIG iMovie exported QT movie I totally wrecked my hard drive and I am now in the process of doing a Zero wipe.
I think it's a good idea to invest in an external Firwire drive for this, seems like you'll have to defrag the drive after each job.
John Manzione