A number of iPhone 3G users have experienced a significant degradation in performance after the iOS 4.0 update. iPhone 3GS users generally report across-the-board performance improvements with the new update, but original iPhone 3G users have reported slow app launching, delayed reactions to taps, and generally poor interface responsiveness.
Perform a “hard reset.” Hold down the sleep/wake and home buttons simultaneously for roughly 15-20 seconds, until the screen powers off then an Apple logo appears, which signifies a reboot. Some users have (oddly enough) reported that performing two hard resets resolves the slowness issue.
Restore, but not from backup. It appears that bad holdover data from iPhone backups can cause performance problems. Restoring as a new phone will delete contacts and other data, but may resolve this issue.
To do so, connect your iPhone or iPod touch to your computer, click “Restore” in iTunes, then choose “setup as new phone.”
Free up space. Make sure that your iPhone has at least 10% of its available memory free. OS X-based systems, such as iOS 4.0, may require some free space to operate properly.
Close open Safari windows. One iOS application that consumes memory in the background is Safari. Close all unused windows in the application by pressing the page switch button in the lower right portion of the screen then clicking the X at the top left of each page. See this page for screenshots.
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