The lens cover acts as a power switch, but there's a hard switch on top, too. The FP series features Panasonic's Venus Engine IV processor, which provides improved performance over earlier models and against much of the ultracompact competition. According to Panasonic, shutter lag times of 0.006 second for the FP3 and 0.007 second for the FP1. Of course, you'll have to add that to the AF speed, which Panasonic didn't release, but was pretty quick in the previous FP model I tested, the FP8. Both FP models have a start-up time of approximately 0.97 second.