What you are experiencing is known as shutter lag; the time between when you press the shutter button and when the shutter actually fires. It is not in the specifications, and is only determined through testing. Some sites that review cameras test for shutter lag, such as imaging-resource.com.

You can overcome a slow responding camera with proper technique, by pre-focusing your shots. Instead of just mashing down on the shutter button when you want to take a photo, anticipate when you will take a photo. Press the shutter button half-way down; you will feel it stop. This engages the camera's focusing and exposure systems. Then when you want to take the shot, press the shutter button all the way down. The capture will be nearly instantaneous.