Importing CD's into iTunes

I have been re-importing my CD's into iTunes b/c all my CD's were MP3 @ 128 kbps and I wanted to re-do them as AAC @ 192 kbps. Now, when I originally imported these I did them on an IBM Thinkpad T30 about a year ago and I averaged about 8x as the import speed. I have been importing these on my iMac and the speed has been all over the place. Some import at 14x - 18x but most are around 5x - 7x.

I guess I would have expected that almost all my CD's would have imported at above 14X with the expection for a few that are scratched, so why so slow? Also why do some import alot faster than others?

Thanks,
Ray

Some of them may have copy protection on them... Which tends to slow it down quite a bit.

I would agree with that, but alot of the CD's are old, prior to copy protection.

It also depends on if you are doing other things on your computer