I've "inherited" an iPhone 3G from a friend who upgraded to iPhone 4. He had complined about the slowness of iOS 4. Although I personally have no problems with it, I was wondering if iOS 4.2 offers any noticeable performance improvement. Does iOS 4.2 improve performance on the iPhone 3G?
From the iLounge article
Thus far iOS 4.2 appears to perform as well as iOS 4.1 did under similar conditions. Performance even on older devices such as the iPhone 3G is the same as iOS 4.1 and thus far we haven’t observed any significant changes in battery life.
IOS4.2.1 is better than 4.1 for sure!!! I did not use yet the 3gs nor the iphone4, and got through every iOS "upgrade" available starting 3.1.3 , 4.0 , 4.0.1, 4.1 and probably yhe last one for the 3G 4.2.1 ! almost as fast as the 3.1.3 ,and with all the advantages of the 4.x ( folders, ibooks, faster maps, faster jawa, geo-tagging new caracters for notes, easier copy paste ((i think...)), etc. deffinatley a good option to upgrade! you will not be sorry!!!
My wife's 3GS which has 3.1.3 runs much faster than my 3GS with 4.3.5(BL1). However I cannot backup her unit in newly purchased MacBook Pro with Lion, but I can backup mine. I see it as Apple's way to force us to upgrade to their latest iOS even if that means to sacrifice performance. I don't like that at all, therefore I chose to backup 3.1.3 to a WinXP machine.