Very slow reads from Mirrored drives

Hi all -
I'm running a Tiger G5 Xserve with mirrored 80Gig SATA drives as the primary HD, and a standalone 250Gig SATA drive in the third bay. At the end of each workday, SuperDuper does a smart update from the mirrored drive to the standalone drive as a backup, and it takes about 40 minutes to run through 40Gigs of data.
I also backup via SuperDuper directly from the mirrored drive to an external 2.5" 80Gig firewire drive once a day for offsite backup, and that takes 40 minutes.
That means I'm getting nearly identical performance to an onboard SATA 3.5" and an external Firewire 400 2.5" - strongly suggesting that it's something in the RAID mirror, rather than in the interface or SATA channel of the receiving drive.
Last week, for some reason, I selected the standalone drive as the source for the backup, and it took 8 minutes. After a bit testing, it seems clear that doing the same backup takes roughly 5x longer when the source is the mirrored drive. The server load is quite light at backup time - under 20% before the backup, under 50% during the backup, even though smart update has a LOT of files to sift.
My understanding is that mirrors are often slower to write than other configurations, as they have to sync, but this is almost entirely a reading transaction, and I've never seen anything about mirrors being so slow to read relative to a standalone.
It this normal? an artifact of the software RAID? Something misconfigured?
It's not a huge problem for me, but since I run this procedure twice a day, it'd sure be nice to have it be one that I come back to in 10 minutes, instead of an hour.
Thanks in advance!

Hi Dean Larue-
This may all be logical, but I would double-check the SuperDuper settings just to make sure that you aren't doing different backup types.
The two 80GB are doing a lot of other stuff whilst you are backing them up and the 250GB just had to read and push files.
I would also imagine that the 2X80GB drives are fuller percentage-wise than the 250GB drive as this too would impact performance.
As it has no files to compare while backing up, SuperDuper is often faster doing the initial backup. Comparing the files on the source drive to the many files on the backup drive takes time.
Luck-
-DP

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