Geekbench founder John Poole appears to have confirmed that Apple is slowing down iPhones with old batteries, based on data from the popular benchmarking application. A recent reddit post sparked speculation that Apple is underclocking the CPU of iPhones with degraded batteries to prevent unintended shutdowns and extend battery lifePoole plotted the kernel density of Geekbench 4 single-core scores for the iPhone 6s and the iPhone 7 running different versions of iOS. Scores obtained in low power mode were not included.
As you can see, there is only one large peak in scores for the iPhone 6s until iOS 10.2.1 when scores are distributed across five peaks. This was the firmware Apple released to fix unexpected shutdowns. The peaks become even more pronounced with iOS 11.2.
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