This morning at around 6:30a-ish there were maybe 50-60 people in the regular line, about 12 in the Priority line (4 waiting for ID check and 8 or so at the screen table/conveyor). The problem seems to be that the Priority and middle (of 3) screening stations were funneling into a single Nude-o-scope, backing up the ID check process. After my ID was checked, I simply went over to the far left (metal detector) line, and was thru in about 60 seconds, leaving those ahead of me in the Priority line still waiting for their "photo op".
Perhaps it's a lack on Priority pax, but SFO always amazes me. Last week, there had to be at least 100 people in the regular line, and I was the only one in the Priority line. From ID check to "getting dressed" was no more than 2 minutes.