ECOs across the network worked this weekend (and last, and Labor Day weekend and the one before that) to try and get through the backlog. If you're waiting for a response keep an eye on your emails tomorrow, while they may have been issued today and yesterday, you won't get the email until printed on Monday.
For those waiting on an application in Chicago, if you got your "application received" email on Aug 30th-Sep 1st there's a good chance you'll see movement tomorrow. From Sep 2nd, numbers received really dropped off and have slowed to a trickle now, so the wait time should considerably decrease this week.