Pretty fast. I was shooting Sporting Clays, sometimes true pairs.
If you are going real fast on doubles, it is easy enough to short stroke it. Even guys that have ran the chidt out of the 870 have been known to do that every once in a while. I used to average 49 out of 50, and would occasionally short stroke and have to shoot the last bird while it was dropping and even a few feet off the ground.. Try shooting it at a dirt bank and not at fast moving doubles, so you can focus on what you are actually doing, not the birds..