Why do my PNG QT clips playback choppy?

I am working on a 3D animation using Blender as the 3D tool, and FC Studio as my editing tool. I render frame stacks from Blender, and Open Sequence with QuickTime Pro, then save those as clips to be used in Final Cut.
I have Blender render each frame as PNG, and thought I'd do a PNG workflow, so I exported from Quicktime as PNG, millions, 24fps. but when I play them back, they are hesitant, and choppy.
Previously, my workflow was the same, only Lightwave3D was my 3D app, and I saved my frames as PSD, imported to QT Pro, then Saved out as Planar RGB. Everything was smooth as could be, even on much less powerful hardware than I have now.
Can anyone say why the PNG clips play so unsmoothly? Is a PNG workflow not a good idea? I selected it because it's lossless, and makes small clips (file size)
my size is 852px x 480 px...certainly WELL within the capabilities of this Mac Pro.
Thanks for any clues!
r

Tom Wolsky wrote:
852 (actually it should be 853 by Apple's calculations)x480 is square pixel 720x480. 720x480 is the same as 853x480 using the correct video pixel aspect ratio.
PNG is a stills codec, it's not a native codec used in video production. Check the FCP sequence presets and you'll a complete list of the native video formats FCP supports.
Alright..I think I'm getting close to epiphany here..thanks for hangin' in with me.
Just to be clear, my 3D out put is square pixels...this is a square pixel workflow from beginning to end. so if I keep everything 853 x 480, and use one of the FCP Presets, then I ought to get smooth playback, not only in FC Studio, but also in Quicktime Player?
Thanks!
r

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