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I used the iPhone 4 for some time and didn't notice the performance going down when I upgraded it to iOS 6. My wife didn't complain either when I upgraded her 3GS, but she's no expert. It's hard for me to judge the 3GS performance as I never owned one and only used my wife's briefly on a few occasions when setting a setting, installing an app or explaining something.
When I got an iPhone 5 (my wife sold her 3GS and got my 4) I did notice it was quicker than the iPhone 4. Of course I skipped the 4S that falls between these two models.
I know some people complain iOS 6 made their iPhone slower, but some say it's faster while I'm a member of the group that didn't notice anything.
I guess we need some kind of benchmark program to see what the numbers say. For some strange reason I've never seen any benchmarks regarding this subject.




Member since:
2011-05-12
It's a personal observation, but I didn't notice anything performance wise when going from iOS 5 to 6 on my iPhone 4. Nor did my wife doing the same on her 3GS. She has my 4 now and is a happy user.
Moving from iOS 3 to 4 on the iPhone 3G really was noticeable in an unpleasant way.