Well, "it" was a rather large archive. So it opened it, and scanned it . . . and the virus scanner said "oh, it's an archive!" and started decompressing it and scanning the files inside.
Now, on a PC, this would be 50% speed for each.
But this is a Mac.
Mac multitasking sucks.
It couldn't have been getting more than 25% speed.
blah. I hate macs :P
(note: I realize this particular bit of bad design wasn't exactly the fault of Mac in general, it was the moron who set the system up. And I realize that MacOSX has no problems with multitasking. I still don't like 'em though.)
(And, just as I finish writing this, it finishes decompressing. Guess what it decides to do? That's right - scan it for viruses! AGAIN!)