We have covered the “Slow Issue” after iPhone 3G is upgraded to iOS 4. There are some interim solutions that may make it running a little bit faster. But for now the best way to solve the slowness issue is to downgrade the 3G iPhone back to iOS 3.1.3.
Earlier in the special event, Apple has shed some light on the issue. With the upcoming release of iOS 4.1 next week, the performance issue is expected to be resolved. The iPhone 3G should run much faster on iOS 4.1 than its predecessor.
Ahead of the public release of iOS 4.1., Lifehacker has performed some basic tests on iPhone 3G to compare its performance on iOS 4.0 and 4.1. As you will see from the video, it showed that iOS 4.1 does improve the overall performance. The iPhone 3G runs much faster and more responsive on iOS 4.1. Here is what Lifehacker mentioned about the test result: