If you jailbroke the iPhone 3G and enabled the multi-task feature I'm sure you're experiencing a shit load of slowing down.
Follow these simple steps to make your 3G faster.
source:
http://cuthut.com/Iphone3gvsiphone3g
Follow these simple steps to make your 3G faster.
Title says it all - iPhone 3G apparently has trouble keeping up with indexing, ever since 3.x. Two days ago, I turned off Spotlight search (Settings-General-Home Button-Spotlight search-switch off all you don't use) because I rarely, if ever, used it.
source:
http://cuthut.com/Iphone3gvsiphone3g