Hmmm... I used DVD Decrypter to rip Alien vs Predator to my 120GB WD 1200JB.
I went ahead with a Deep Analysis with DVD Shrink, then just encoded to the HDD with the following results:
HQAEC: Enabled (Maximum Sharpness)
Run backup in low priority mode: Not Checked
Time:
28min 53sec
HQAEC: Enabled (Maximum Sharpness)
Run backup in low priority mode: Checked
Time:
28min 51sec
HQAEC: Disabled
Run backup in low priority mode: Not Checked
Time:
12min 8sec
HQAEC: Disabled
Run backup in low priority mode: Checked
Time:
12min 0sec
Even though I noticed the processor usage dropping at times with low priority checked, it was still faster than running without it checked, and the processor usage staying maxed out...
I think I will see what happens when I use my Raptor for the rip, and encode to the 1200JB....
EDIT: Here are the times with the rip placed on the Raptor, encoding to the 1200JB:
HQAEC: Enabled (Maximum Sharpness)
Run backup in low priority mode: Not Checked
Time:
28min 6sec
HQAEC: Enabled (Maximum Sharpness)
Run backup in low priority mode: Checked
Time:
28min 16sec
HQAEC: Disabled
Run backup in low priority mode: Not Checked
Time:
9min 47sec
HQAEC: Disabled
Run backup in low priority mode: Checked
Time:
9min 50sec
Results are somewhat confusing... But as expected, encoding from the Raptor to the 1200JB did help the times somewhat... These results came more into line, as the high priority times were faster, compared to the low priority mode box checked...
Anyway, it appears that there is not really much of a difference between the low and high priority modes as I originally thought from watching the CPU Usage.....
I am expecting a 74GB Raptor to arrive this week...

It will be interesting to see how much time is shaved encoding from Raptor to Raptor.....