Image export question

Image export question

Can anyone tell me why an empty frame, with the camera background set to transparent takes 2.5 minutes to render? And Cheetah is maxing out the 8 3.2 ghz processors in my new MacPro to do it! This can't be right, can it?

I am exporting a 120 frame animation at 2560 x 1440 resolution. It is a bunch of 3D text flying in and out of frame. I thought I would save a bunch of time by rendering the actual background as a still image, and then render all of the lettering with a transparent background, and then composite the two clips in FCE.

I was surprised to see that it took so long to render nothing. Lighting is an HDR and a single direct light and no radiosity tag.

Am I missing a setting somewhere?

Thanks, Chuck
 
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