Transcoding Test Results

I did a test and wanted to share the results with the FCP X Apple community.
I took 6 clips from a Canon 5D Mark II (h.264) and laid them down in FCP X 10.0.1's timeline, applied a color effect on all the clips, then exported to h.264:
Test 1:
No transcoding at all
Render time 4 minutes
Test 2:
Transcoded to ProRes 422 HQ in Compressor
Render time 4 minutes (plus 4 minutes to transcode)
Test 3:
Transcoded in FCP X default option
Render time 4 minutes (plus 4 minutes to transcode)
The output of all of them looks identical to me. I see no quality improvement in the final output and the render time is the same.
However, the skimming responsiveness in FCP X was much, much better using the transcoded media versus the native h.264. I can imagine that this is magnified even more on a real project.
Side note - I did the same test in Premiere CS5.5.2 and the rendering (export) took significantly longer using native h.264 than the ProRes 422 footage. If you add that up over the entire project, you aren't saving any time using native h.264 and skipping the transcoding. The transcoding is a one-time process.

Thanks Scot. Can you give details of the computer you're using including the graphics card? Thanks very much.

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