Why is quicktime slower when using multiple mdat atoms

Hi,
I've been trying to generate a mov file and I noticed that the more mdat atoms I put in my mov file the more the file takes time to load on QuickTime, iTunes.
Even worst, on the iPhone the file takes more than 3 minutes to load.
If there are too many mdat atoms quicktime even says that the file is invalid ( error -2004 or -2002, I don't remember exactly).
Why is quicktime/iTunes slower when using multiple mdat atoms ?
Thanks,

Yeah! Problem solved: It's a QT issue.
Cause: Mac Update Software downloaded a faulty QT.
Solution: Download QT from Apple's QT site.
Great to have the Video back

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