With Fakeclockup, you can speed up your iPhone to 10x faster, this tweak accelerate the UIKit transition animation. To download this tweak:
1. Go to cydia
2. Tap to sources, edit, add, http://hitoriblog.com/apt
3. Download Fakeclockup
To modify this app, go to your iPhone’s settings, you will see Fakeclockup in the bottom of the page, open it and change the animation speed, with x1/10 as the slowest, and x10 being the fastest. Do not forget to Respring your device.