@Topnotchman
The reason I started the experiment is because I sent in a 30 piece set, pre-screened 9.8. Once it arrived they split the set into 25 and 5. The 5 piece was completed 16 days before the rest of the order, given a different submission number (one number off -08/-09), etc.
I would disagree that a Pre-screen should add more time. I am still looking for 9.8. There isn't much of a difference for 9.6 to 9.8+, small but not much. Both orders should go through the same process, with a grader looking at book X Y and Z. Yet once they determine one doesn't make the cut, it would get set aside and time would be saved as it would not require sealing, labeling, and slabbing. Sending them through separate channels would be counterproductive to grading. As the books should be getting graded by a person with only their determined score being the difference. Even still, it would be better if grader knew ahead of time if an order is a pre-sceen request. That would save them time too. As once the grader finds a flaw, or enough flaws, the book can be set aside, job done, next book up, no more grading, and no further paperwork required.
CGC is getting paid to grade each book regardless of it being slabbed. Apparently, slabbing and labeling costs extra over the $5 for one that doesn't make the Pre-screen grade.