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Depends on the CPU speed and the complexity and format of the sequence.

If you edit UNCOMPRESSED HD and use a Quad+ Core CPU you might see an improvement.

But as you mention iMovie, I think you likely just use AIC.
 
Considering SSD for a MacBook pro 13 base model and possibly a iMac i7 2.93. As for type of video it'd be 720p h.264 video capture from a hauppauge hdpvr via eyetv
 
Depends on the CPU speed and the complexity and format of the sequence.

If you edit UNCOMPRESSED HD and use a Quad+ Core CPU you might see an improvement.

But as you mention iMovie, I think you likely just use AIC.

it does not affect rendering but it may effect compressing

i do renders in Blender3D
 
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