Compressor very slow - DETAILS AND SETTING INSIDE

Hello,
Compressor is working very slowly. I am sending sequences from FCP to compressor. I just want a small, low quality version to upload to youtube (as a preview for my client) and compressor is taking up to 2 hours to compress a 6 min. long movie. I'm using the following settings:
Name: YT FSP
Description: H.264 video at 8 Mbps with AAC 44.1kHz audio
File Extension: mov
Estimated size: unknown
Audio Encoder
AAC, Stereo (L R), 44.100 kHz
Video Encoder
Format: QT
Width: 640
Height: 480
Pixel aspect ratio: 0.75
Crop: None
Padding: None
Frame rate: (100% of source)
Selected: 29.97
Frame Controls On:
Retiming: (Fast) Nearest Frame
Resize Filter: Linear Filter
Deinterlace Filter: Best (Motion Compensated)
Adaptive Details: On
Antialias: 0
Detail Level: 0
Field Output: Progressive
Codec Type: H.264
Multi-pass: On, frame reorder: On
Pixel depth: 24
Spatial quality: 50
Min. Spatial quality: 25
Key frame interval: 24
Temporal quality: 50
Min. temporal quality: 25
Any help's appreciated. Thanks!
-Jon

What type of file is the source media? What resolution? If it's HD 1280x720, for example, or if it's already been encoded as one format (MP4, H.264, etc), you're asking Compressor to shrink the file and re-encode, which can take time.
Also, if you have an older machine with 2 or less processors, they can heat up very quickly in which case it can take a VERY long time to compress. If your computer is super hot, I'd suggest trying to get a fan or place it on an AC vent - something to help cool it down to speed rendering.

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