iOS 5 on iPhone 3GS, But How Well Does it Run?

Last time when Apple released iOS 4, there was some concern from iPhone 3G users who protest that iOS 4 will hamper their iPhone forcing them to take this drastic step of downgrading to iPhone OS 3.1.3. Just two days back, Apple has released iOS 5 at WWDC and even though iPhone 3GS users got…