iPhone 3G came out in 2008 - nice, because it was new - but yes, had lots of lag - better than the competition (at the time). 3GS gave it a bit of a boost. iPhone 4 was the first (in my experience) iPhone to significantly reduce lag/latency in most areas - the shutter speed was it's achilles heel (it sucks). I'm upgrading to the 4S for one reason only - Supposed zero shutter lag.