Quicktime has started to 'judder' when playing HD?

MacBook Pro 1.16 Intel Core Duo (2G DDR2 memory) ; Quicktime 7.5.5
Quicktime has recently started to judder, stutter, when playing HDV 3/4's size or full screen. This is on a MacBook Pro Intel. It hasn't always done this. And.... I notice that when I'm playing the video clips through the Safari Browser (obviously accessing Quicktime) the clips play smoother.
I've never had a 100% smooth play, but it used to be FAIRLY smooth. I reboot, I fix permissions. Still juddering. I'm running Quicktime 7.5.5. And I'm wondering if I'm not TOO updated, trying to run a Leopard Quicktime on a Tiger operating system ... or something like that??
Ben

Hi Klaus,
I've not updated coz I'm super busy with half-a-dozen mind-distorting projects constantly challenging my ability to 'maintain'. The idea of down time while I sort out a new operating system ... even an hour or two ... is too terrifying.
As both Tiger and Leopard have a Quicktime 7.5.5 ... I'm wondering how to tell which is which? Or whether the Leopard Quicktime will even run on Tiger?
Ben

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