Why such long render times with SD footage?

I'm putting together a three-minute video for my FSAE racing team. Footage is standard-def video from three different cameras we had on-car. I have the videos set up as a multiclip for about two minutes in the timeline; FCP says the render will take about an hour to complete. No effects, just multiple angles. CPU utilization is at 120%.
Is there any reason in particular why FCP isn't utilizing more processing power?
(Mac pro, Octo 2.8ghz, 10gb ram)

What codec is this said footage?
Shane

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