I'm frustrated too -- but think of it like this. Remember how in the few months running up to June 11th, everyone was applying as fast as they could? The time to get an AOR kept getting longer. I think people in January and February got AOR after a couple of weeks or so; then April was up to three weeks or so; I applied in early May and got AOR after 5 weeks.
There's a big bulge of applicants moving through the system, and May + 10 days of June is the biggest part of the bulge. It doesn't look like they've worked their way through April yet, I imagine that the three-four weeks it took April to get AORs will equal 2-3 months for tests and oaths. Taking the test and oath is more labour intensive than just opening an application and confirming everything is there.
Plus, people are on vacation now, they are looking forward to some time off, they see the file cabinet groaning with May applications and they think "Eh, I'll open that up when I come back . . ."
Have a good Christmas, everyone!