Apple's iOS 27 update will prioritize cleaning up the operating system's internals, with engineers making changes that could result in better battery life, according to Bloomberg's Mark Gurman. The effort is said to be similar to what Apple did with its Snow Leopard Mac update years ago, and will involve removing old code, rewriting existing features, and subtly upgrading apps to improve their performance. The result should hopefully be a "snappier, more responsive" OS, says Gurman.

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iOS 27, codenamed 'Rave', will focus on internal cleanup similar to Apple's Snow Leopard update. Engineers plan to remove old code, rewrite features, and upgrade apps to improve performance and battery life. The update will include minor interface tweaks but nothing as dramatic as iOS 26's Liquid Glass overhaul. This cleanup effort is particularly important as Apple prepares to launch new device categories like a touchscreen MacBook Pro and foldable iPhone in late 2026. The update will also continue work on AI improvements, with delayed Siri features now expected in iOS 27.

iOS 27 'Rave' Update to Clean Up Code, Could Boost Battery Life