Video Stalls - Larger File Size

Just downloaded Battlestar Galactica season 2 and the video stalls at full screen. Do not have this problem with previous Battlestar Galactica shows and movies that I have downloaded in the past.
I notice the File Size and Total Bit Rate of the new shows are three times greater in size than the shows I've downloaded in the past.
Using the utility ativity monitor, I notice I'm maxing out my CPU when I go to full screen which I think is causing my video stall.
I also notice that now my previous TV show downloads don't fully fill my screen like that did before the new downloads.
I hope someone might know how I can get my TV shows back to working normal at full screen and why the new TV shows file sizes are larger than before.
Thanks for Your Help
Ricky
PowerBook G4 15" LCD 1.67GHz Mac OS X (10.3.9)

Thanks for the reply. Shortly after I posted, I started to relize that Apple was offering better TV Show quality which results in larger file sizes. I also went to my Energy Saver section in System Prefrences and found my Optimize Energy Settings was set for Presentations. I changed it to Highest Performance which resolved the issue.
iTunes 7.0.2
Quicktime 7.1.3
RAM 512MB
Thanks for your help.

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