> Basically, you can't expect a single processor to do 3 or 4 CPU
> intensive things simultaneously without some hiccups.

Let me restate the situation. Scrolling a window *never* affects music,
because music playback, being interrupt-driven, pre-empts the currently
running task. This is why if your music player app is too heavy (like
iTunes), the whole machine starts to crawl - applications are being forced
off the CPU by the OS in favour of the music task from the interrupt system.

There should never be any hiccups involving music vs. other tasks unless
some process actually switches off interrupts (like MacsBug) or perhaps
itself runs at interrupt level and stops other interrupts from running.

This is why I can't determine any reason for the issue, and thus wonder what
the network driver is doing to the machine.


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