I do not see a correlation between packet size and adjudication speed. Not all evidence is examined page by page.
Otherwise, small packet or big packet, I-751 form itself is what adjudicator looks at, and it's the same number of pages every time.
Whenever they need supporting docs, they open table of contents, look up entry such as: "Bank of America statements, page 12-100". They go to page 12, look at a statement or two and that's it, skip to next evidence such as utility bills. What page is that? That's page 304. Ok, got a statement or two from there.
There's no rocket science here, it doesn't matter if evidence is large, it would take similar time to review.
Now, if adjudicator suspects something, then yes they'll study everything. But again, they don't have to remember all the figures or all information from all pages. Just glance over it.
USCIS says in instructions to send as much evidence as you can.
Unless you're trying to guess what they want, you'd follow instructions literally.
I worked with lawyers for AOS and I-751. There was never a pushback or surprise about evidence I submitted, and there were hundreds of pages. Everybody in immigration is used to thick files.
It's the thick file without substance or thin file that brings attention.