If you updated your iPhone 3G and/or iPod Touch 2G to the latest iOS 4 firmware, you might have noticed that the new OS slows down your iDevice, esp if you have enabled the multitasking and homescreen wallpapers by jailbreaking. Here is very simple trick to speed up iPhone 3G and iPod Touch 2G.
This method is not recommended for iPhone 4, iPhone 3GS or iPod Touch 3G because its not that much useful for these devices. The trick is that you exclude all the items from Spotlight search on your device.
Watch the video to learn how to do it: