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Geekbench developer links iPhone performance issues to battery age and iOS updates

<div class="feat-image">(https://9to5mac.files.wordpress.com/2017/10/apple-iphone-71.jpg?quality=82&strip=all&w=1600)</div><p>[<strong>Update</strong>: Developer Guilherme Rambo has discovered the software system, powerd (https://twitter.com/_inside/status/942847979991523328) (short for power daemon), that Apple put in place in iOS 10.2.1. powerd controls CPU/GPU speed and power. It also responds to thermal pressure (https://twitter.com/_inside/status/942844354217029633) and helps iPhones from catching fire.</p>
<p>Since powerd was first released in 10.2.1 (https://twitter.com/_inside/status/942848593165193216), this looks to be separate from the Low Power Mode feature and directly related to the performance and battery age issues.]</p>
<p>Last week we reported on the news that a new battery could solve performance issues (https://9to5mac.com/2017/12/10/iphone-6s-slow-down-battery-fix/) with older iPhone models like the 6s. Today, Geekbench founder, John Poole, published an article (https://www.geekbench.com/blog/2017/12/iphone-performance-and-battery-age/) describing his findings after diving deeper into the relationship between iPhone performance and battery age.</p>
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