System seems unsually unstable

I have a G4 400MHz PPC with 384 MB SDRAM. It's old, yes, but I'm still using it regularly and still like my machine.
However, for some reason, it seems that it can't handle tasks, perhaps 'heavy' tasks, as easily anymore. At least sometimes.
For example, when I used to watch videos in QuickTime or VLC, it would generally play smoothly and maybe drop some frames a little bit if I had something CPU-intensive goin gon in the background. When I played a DVD through the Apple DVD Player, it would virtually always be just fine.
Browsers, messengers, etc. could be open and always the DVD Played fine and VLC/QT would almost always be just fine.
But now? I just watched a DVD and there would be jitters in the film maybe happening every 15-25 seconds or so. To top it off, I only had 3 programs running and none of them use a significant percentage of the CPU or ram. What gives?
I really don't get it... the daily/weekly/monthly maintenance (Cron) runs fairly regularly as it should, and my system is generally just fine and works well enough for me.
Im not stupid when it comes to computers.. I'm no genius, but I've learned quite a bit about computers in general as well as OS X, and even my very-computer-inclined-Linux-nerd roomate is confused.
Any suggestions in regards to diagnosing the issue is appreciated.
Oh, and the DVD was not a homemade one... it was a major film release.

Hi, Andrew.
1. Did you rename your Home folder? If so, see "Mac OS X 10.3, 10.4 or later: Return to default desktop, apparent 'loss' of home directory."
2. Are you using FileVault? If so, try the instructions in "Mac OS X 10.3, 10.4: FileVault - How to verify or repair a home directory image."
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X

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