As promised, I installed iOS 8 on an older iOS device to see if it bogged down, lost functionality, or just became a pain to use. Actually, I installed it on two devices — an iPhone 4s and a first-gen iPad with Retina Display. Both devices use an Apple A5 processor, except that the iPad’s is up-armored with a better graphic coprocessor.
I didn’t do any sort of extensive testing, deciding instead it would be more useful just to mess around with them like I would in normal day-to-day use for most of a week.
The short version? Go ahead and upgrade your iPhone 4S. Mine (my four-year-old’s, really) runs just fine. If load times take longer, they didn’t take noticeably longer. Nate still plays Angry Birds just fine.
Results were less clear on that old iPad, however.
iOS 8 feels like it’s ramped up multitouch sensitivity, which in and of itself is no bad thing. And the touchscreen doesn’t have any problems handling the increased sensitivity. But the display itself does sometimes have trouble keeping up — on occasion I get very un-iOS-like hesitations, instead of the instantaneous reactions I’m used to getting. As a result, I sometimes try the same action twice, only to have initiated a second action instead.
It’s not a huge deal, and I don’t know for sure if iOS 8 really does increase touch sensitivity. But that’s how it feels, and the A5X CPU is just a little too old and slow to pump 2 million pixels as quickly as iOS 8 demands.
If that’s a concern to you, don’t upgrade — and I’ll post on this again when the inevitable 8.1 release comes out.