At Sat, 30 Nov 2013 14:51:01 GMT, there was a sudden drop in the close votes review queue size from 98932 to 98314. This is about 600 questions over the course of one minute.

It doesn't seem like a routine cleanup script. If it was, this is a very odd time for it to run. Also, the drop occurred over the span of a minute, so it's highly unlikely there was simply increased review activity. So, I ask: What was its cause?

(yes please don't shoot me I know my freehand circle is blue) (it's actually a dark teal look again) (the source for this script I credit to acheong87 (slightly modified), found through the CV meetup post)

Raw data:

Epoch time  CV Size
1385822821  98932
1385822881  98932
1385822941  98932
1385823001  98932
*** 1385823061  98932
*** 1385823121  98314
    [author's note: the difference between iterations is 60 seconds]
1385823181  98314
1385823241  98314
1385823301  98314
1385823361  98314