Why apple i-phone 3g running very slow on IOS 4.1 jailbreak?

I have also faced this problem but now my phone is performing well. I have some tips for you. Well, iOS 4 is a great OS for newer iPhone models, it also made my older iPhone 3G slow down to a crawl, with everything delayed and stammering to get closer to touch. The first Updating is thing that you should do is to grip the iOS 4.1 download while it solve some of the speed troubles. After you put in iOS 4.1, join the update with the following tips to regain your iPhone 3G speed:

Stop Spotlight on iPhone 3G,

Tap on-Settings

Tap on-General- Navigate to and select-Home Button

Scroll down to-Spotlight Search

Immobilize the whole thing by tapping the check box next to each item

Exit settings

Bottom line: if you don’t use Spotlight in iOS, disable it!

Hard reset iPhone 3G: Hard resetting your iPhone can speed it up for a while.

Follow these steps: Push and grip the Home button and the Sleep/Wake button at the same time hold both for about 5 seconds. Ignore the typical- Slide to power off message and continue holding both buttons awaiting the iPhone shuts itself off

Let iOS boot as usual, your phone should be temporarily sped up

Restore factory settings and do not restore from backup

Downgrade from iOS 4 to iOS 3.1.3

The final up gradation release of iOS 4.1 construct the iPhone 3G run a lot better than iOS 4, but iPhone OS 3.1.3 is quicker yet.

You can take help from www.apple.com.

Best of luck!