QC View v's QC Renderer performance?

I'm very new at this - I've made a small cocoa app with a Quartz Composition to display a live feed from a firewire connected DV camera. I used QC View to add the composition into a window and have a QCPatchController to allow the user to change a few published settings.
With standard DV input the performance is fine, but the app does use about 30-40% of the processor's on a Dual G5 2.0. However I am also trying to make the app work with a DVCPRO HD input which is a more processor intensive codec and the performance for this is unusable.
In reading on a bit further, it seems that what I should do now is to use QC Renderer to play the composition. Does this allow greater performance with the overlay as its using an 'OpenGL context'?
What's not entirely clear to me is what advantage I will get by using the QCRenderer - obviously its a lot more about actual code writing but the Apple doc,s have gotten me this far!
Alternatively, perhaps I should be using QTKit instead of a Quartz Composition - the main features must be allow live preview of video input, allow real time 180 degree rotation and real time de-saturation.
Any insight's much appreciated.
Mark
P.S - Here is the current app:
http://homepage.mac.com/mark.burton/app/FlipFlop.zip

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