H.264 - Taking forever to encode? What's wrong?

I have captured some video of my desktop using iShowU, which basically makes a Quicktime of everything that happens on your desktop including a mic input. I used the Apple Intermediate Codec to capture the material. The size of the vid is 1900 x 1250 (75% of the full size 30" display desktop).
I imported this recording direct into FCP and did some quick edits, now I'm trying to export them using compressor as quicktime files that will be distributed on a CD.
The export happens and the final quality is fine, but the export is taking FOREVER. I've done video editing before and this seems way too long to export. Here are the specs...
- It is taking about 15 minutes to export 1 minute of video. This is way way way too long.
- I'm running a new Mac Pro, 2.66 Quad Core, 5GB of Ram with high speed drives - this machine should scream through this encode job. Activity monitor is showing about 130% processor activity from Compressor, and another 90% or so from Final Cut Pro. I think it should peg the processors a bit higher than that.
Here are the exact settings I'm using in Compressor:
Name: Test 1 QuickTime Movie
Description: No description
File Extension: mov
Audio Encoder
IMA 4:1, Stereo (L R), 44.100 kHz
Video Encoder
Format: QT
Width: 1900
Height: 1250
Pixel aspect ratio: square
Crop: None
Frame rate: (100% of source)
Frame Controls:
Retiming: Nearest Frame
Resize Filter: Nearest Pixel
Deinterlace Filter: Line Averaging
Adaptive Details: Off
Antialias: 0
Detail Level: 0
Field Output: Progressive
Codec Type: H.264
Multi-pass: On, frame reorder: On
Pixel depth: 24
Spatial quality: 74
Min. Spatial quality: 25
Key frame interval: 24
Temporal quality: 50
Min. temporal quality: 25
Fast Start: on
Brightness And Contrast
Brightness: 6.600000
Contrast: 11.600000
I am running that one Bright/Contrast filter, but that shouldn't take up that much extra power should it? Surely I have something wrong here. The export frame rate, size (pixel demensions) and everything else are exactly the same as the source material from what I can tell.
I'm going to have about 15 total hours of footage to export and from what I can tell using these settings - that's nearly 10 straight days of encoding, and that ain't gonna' work.
Thanks!!!

H.264 is much slower codec than many other ones.
And, at those giant frame sizes, it wouldn't
surprise me to see such long encode times.
More than six hours ago, I took four short (six minutes or so each) Flash video files to Compressor 3 and sent this batch to transcode to H.264. The first clip went off merrily and the Activity Monitor showed 145% activity of the CPU. It was done in 13 minutes, the second ckip took 14 minutes and the remaining two clips are still there with very little progress in transcoding. The Activity Monitor shows from five to 10 per cent Compressor usage of the CPU.
This is definitely not due to "giant frame sizes". Somewhere along the way Compressor 3 slowed down dramatically.

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