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...I have read more than a few posts about people not liking to edit AVCHD natively in Premiere Pro and Sony Vegas Pro 9....it seems machine performance suffers greatly.
That's not true for Premiere Pro CS5 at least on a MacPro (or PC) equipped with one of NVIDIAS CUDA compatible grafikcards. I do own both: a MacPro with NVIDIA's Geforce GTX 285 and Adobe Premiere Pro CS5. Actually, even applying color correction filters on native AVCHD clips works well without rendering the clip. In fact the gpu does all the work in the backround on the fly.

P.S.: I switched back to Premiere after 10 years of experience with FCP and don't regret it yet.
 
While I don't doubt your report, neither do I doubt the experience of other professionals. It all goes into the big melting pot that is my head :D
 
CUDA is all what you need

While I don't doubt your report, neither do I doubt the experience of other professionals. It all goes into the big melting pot that is my head :D
See: what did those pros say about their hardware? If they used ATI boards for example, those nicely designed graphic cards might be fast as light but nevertheless don't support CUDA.

Once again: Premiere Pro CS5 only does the job quickly when CUDA supported boards are installed. If not, all the work has to be done by the CPU-kernels of your mac and in this case you are doomed.

I personally do have a GTX 285 installed in my MacPro and are waiting for the just pre ordered PTY NVIDIA Quadro 4000 (including displayport support).
 
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