Apple's iOS 27 targets battery life boost through major code cleanup and performance overhaul

Reviewed byNidhi Govil

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Apple is preparing iOS 27 with extensive code cleanup aimed at improving battery life and system performance. Bloomberg's Mark Gurman reports the company will remove legacy code, rewrite features, and implement interface tweaks to address the performance degradation seen in iOS 26. This marks Apple's first major performance-focused update since iOS 12 in 2018.

Apple Plans Major Code Cleanup for iOS 27

Apple is planning a significant overhaul of its mobile operating system with iOS 27, focusing primarily on performance improvements and battery life enhancements through extensive code cleanup. According to Bloomberg's Mark Gurman in his Power On newsletter, the Cupertino-based tech giant will systematically remove obsolete code written for previous iOS versions, rewrite existing features, and subtly upgrade applications to create a more responsive software environment

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Source: 9to5Mac

Source: 9to5Mac

The approach mirrors Apple's strategy with Mac OS X Snow Leopard in 2009, a release that prioritized speed and reliability over new user-facing capabilities. Gurman describes iOS as "a bit of the mess under the hood," reflecting growing concerns about software quality that have emerged in recent years

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. Users have noticed an uptick in bugs, iOS performance issues, and reduced battery efficiency across recent releases, marking a departure from Apple's historically strong reputation for polished software.

Battery Efficiency Gains Through Architectural Refinements

Engineers working on iOS 27, code-named Rave, are targeting measurable battery efficiency improvements as a direct result of the codebase optimization

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. The company hopes that underlying code changes will result in efficiency gains that give users extended usage times without compromising system capabilities

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. This focus on power efficiency represents a significant engineering priority, marking the first time since iOS 12 in 2018 that Apple has mounted a major initiative specifically targeting iPhone performance and battery conservation

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The cleanup effort follows the release of iOS 26, which introduced the Liquid Glass design language but resulted in noticeable performance degradation, particularly on older iPhone models

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. Apple plans to implement interface tweaks specifically designed to mitigate the performance overhead introduced by Liquid Glass, though these changes are expected to be more subtle than the visual overhaul seen in the previous version

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Source: Gadgets 360

Source: Gadgets 360

Enhanced AI Integration and Conversational Siri Development

Alongside system-wide performance improvements, Apple reportedly plans to significantly enhance Apple's AI capabilities within iOS 27. The strategy includes deeper AI integration across the entire operating system and the development of a more conversational Siri interface, representing a shift toward more natural user interactions

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. The AI-powered Siri, unveiled during WWDC 2024, has been in development for nearly two years and is expected to arrive with iOS 26.5 and iOS 27 firmware versions

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Some of Apple's key Siri promises made at WWDC 2024 have been delayed to iOS 27, with reports suggesting the company is working towards a Siri chatbot of sorts

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. Apple has encountered significant delays and public criticism regarding the rollout of its initial AI features, prompting scrutiny regarding its competitive position against industry rivals. The development and release of iOS 27 presents the company with its most substantial opportunity to reset market expectations and demonstrate its ability to compete in the rapidly evolving AI landscape

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What This Snow Leopard Update Means for iPhone Users

The software update is expected to roll out later this year, likely coinciding with the launch of the rumored iPhone 18 Pro series and potentially Apple's first foldable device in September

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. By stripping away legacy code and refining existing frameworks, Apple aims to create a lighter, more responsive operating system that addresses the declining software quality users have experienced

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It remains unclear whether Apple will actively market these performance and battery life improvements or simply position them as natural benefits of the cleanup process

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. For users frustrated by recent bug fixes delays and diminishing voice assistant performance, iOS 27 could represent a meaningful step toward restoring confidence in Apple's commitment to delivering polished, efficient software experiences.

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