iOS 5 through iOS 9 speed test on iPhone 4s confirms iOS gets slower every year on older devices

Those who are still clinging onto older iPhones will tell you that their devices get slower with every iOS update that Apple rolls out — and they’re not wrong.
In a new speed test that compares iOS 5 with iOS 9 and every major release in between, we get confirmation that older firmwares are faster on aging hardware.
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