A tweak for speeding up your iPhone 4 is available in CYDIA. As we know that users always complain about the slowing down of the response time of their iPhone after installing many Apps or running a games. Therefore to overcome such issues or complaints a Tweak has been introduced in Cydia for iPhone 4 which boosts the speed of your device & off-course this tweak is only available for Jail Broken iPhones.
This Tweak is available in the repo “repo.insanelyi.com” with a name “Speed Intensifier” . Speed Intensifier is basically a combination of 2 tweaks one for Setting.App & other for WinterBoard.