iPhone 3G users have found their phone a bit slow, after upgrading to the latest IOS 4. Something that has worked for many people is a hard reboot .
Developer Daniel were Digla recommends also disable the Spotlight search ( Settings / General / Home / Spotlight search), because it seems that normally shut down and restart the iPhone does not seem to have a real effect , when the iPhone is closed to a disk image.
In other words, a normal restart (by pressing and holding the mouse sleep / wake superior, until the red slider out , then turn off the phone, and then back on again) just puts it where it was.
In order to force the IOS to rebuild ( a step that appears to optimize a variety of functions) , you have to press and holding the Sleep / Wake , along with the Home button , for about ten seconds, turn off the phone and initiate a reboot .
The iPhone 4 is a passivity , for about 30 seconds, but when it does the same procedure on an iPhone 3G can be extended to four minutes , until the home screen and the Apple logo , before returning to Home.
However, as the developer says Dilger, then it should be noted that is better optimized. Of course, the hardware of the iPhone 3G is much more limited in terms of processing power and memory available. more