Let the hive mind of Engadget get that for you.
"We need a digital camera that can be switched on and fire off that first shot fast. It's not a commonly tracked statistic on any review site, and nobody seems to have this information for every camera. We were hoping other readers could inform us as to what small digital cameras can fire off their first pics in under a second (ideally under half a second). It needs to be small, but mostly, just really quick in operation. Thanks!"
Chuckle... Not tooting my horn but I patented this back in 1995 (patent #5,673,322 - http://www.patentstorm.us/patents/5673322.html). Back in the days before fire and the wheel were wide spread use (pre wireless IP circa Mobitex days), this patent made more sense when you need to get a web browser with a local proxy to traverse a non-IP network to get to the Internet. IBM and Telcordia (assigned to Geoworks) own the IPR. I implemented protocol boosters and local differential caching as part of the patent before we ran out of money in 2002 and 1st gen GPRS and 1xRTT started taking off in the U.S.