Mpeg-4, very slow to load in iTunes/Podcast

Hi, I've not yet published any video podcasts to iTMS, but am testing...
MPEG-4 video file
5:19
10Mb in filesize
shot at 12 fps
bit rate:128kbps
sample rate 44.100Khz
profile Low complexity
Channels: Mono.
Why if I select my podcast in iTunes after subscribing to it does it take 10x longer to load and play in comparison with similar sized podcasts of same specs?
Using QuickTime Pro to create MPEG-4 video files, from .mov tutorials shot with SnapzPro. Also tested original .Mov files.
Even a 'get info" takes forever to show details.
The files are loaded on .Mac.
I don't want to publish until I've sorted this issue out.
I'm hoping someone has encountered similar issues, and has found a solution.

Should I maybe post this in the quicktime discussions to have a better chance of response?

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