Tip 1, delete all the photos in the iphone, or save all the photos in the iphone to the computer to keep the album in place enough to make sure that the camera starts to reduce the time it takes to load the thumbnail and calculate the number of photos;
Tip 2, restart the iphone at least once a week to clear the system of excess resources (reboot the iphone: Hold down the power button and the home key at the same time for about 10 seconds until the iphone shows the white Apple logo and let it Go)
Tip 3, the background program remembers not commonly used to shut off, this may also affect the camera's startup time. Or use the Killbackground key to close all applications in the background.
Small hint, above three kinds of method is actually you to the Apple handset a little normal maintenance, if all operation is still not OK we can the handset firmware upgrades Oh.