Multiprocessing taking ages to skip existing frames

Hello
Just recently got a new system and am new to multiprocessing.
8 cores, 24GB RAM, Windows 64bit Ultimate
Running After Effects CS5.
I am rendering out PSD sequences.
If I turn MP on and give it 5 cores to work with it will take an age to skip existing frames. It skips 5 at a time and takes almost as long as if it were actually rendering the frames freshly.
If I turn MP off then it skips the frames like lightning! But obviously just rendering 1 at a time.
Am i missing some blantantly obvious setting somewhere?
Any help would be much appreciated and this issue has effectively removed the possibility of sleep for me for the next couple of days!!

Thanks!
I am currently doing a render right now so cannot test but I think it also exhibits this behaviour even when using stills in a 3d comp with nothing but masks applied.
Fingers crossed though it is a rogue effect somewhere there that I can eliminate.
On a complete side note do you know of an equivalent plugin effect to Shadow/Highlight? I use it a lot but it knocks out MP which is a little frustrating.

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     Index page CR count:               566.0000000000000000
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Actual step count:                      20
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