IMac - Short pauses during gameplay

Hi all -
I have a 2.4 GHz Core 2 Duo Intel iMac with 4GB RAM running OSX 10.5.4. I also run Boot Camp on my system quite frequently for Windows gaming. The issue that I am having is that games, whether in Windows or OSX, tend to encounter a short half-second to three second pause every minute or so. It appears as if there is some swapping issues going on, as the pauses only tend to occur when sounds are played or when I'm turning a corner in a first-person shooter.
These errors occur regardless of operating system or game - I've been playing Team Fortress 2 in Windows with very good performance save for the pauses. I've also been playing Diablo II, a ten year old game, in both Windows and OSX, and still have the pausing issue. Since this issue occurs in both Windows and OSX, I can only assume that there is a hardware issue somewhere that I am missing.
I don't really know if I am experiencing similar issues outside of games, as I generally am not running intensive tasks that require asset loading from disk.
Anyone else experience this?

Working on this a little more, it seems like the issue is directly related to sounds being played. Any time a sound is played that hasn't been played in a while the system experiences this slowdown. In games, it is experienced as a short pause, and then the game quickly speeds up to catch up to where it should have been.
The issue is incredibly infuriating... I guess I should look into talking to Apple support about it.

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