Does iOS 12 Improve iPhone and iPad Boot Times?

Apple designed iOS 12 with a major emphasis on performance and responsiveness, especially for older hardware. While the update delivered substantial real-world speed enhancements—such as faster app launches, quicker keyboard display, and snappier camera access—it did not improve overall cold boot-up times for iPhones and iPads. In most independent benchmark tests, devices running iOS 12 booted up at speeds comparable to, or slightly slower than, iOS 11.

During the launch of iOS 12, Apple explicitly targeted daily interaction speed. The operating system optimized how the processor ramps up its clock speed when handling immediate workloads, such as launching apps or scrolling through heavy content. However, the system initialization sequence—the process the device goes through when starting from a powered-off state—did not receive this specific optimization.

Comprehensive testing conducted across various older devices, including the iPhone 5s, iPhone 6, iPhone 6s, and various iPad models, consistently revealed that cold boots took roughly the same amount of time or added a few seconds compared to iOS 11.4.1. Newer devices with faster NVMe storage, such as the iPhone 7, iPhone 8, and iPhone X, showed virtually no noticeable variation in boot speed between the two operating system versions.

The lack of boot-up improvements does not diminish the overall performance advantages of iOS 12. Because modern mobile operating systems are designed to remain powered on or in low-power standby mode for weeks or months at a time, Apple prioritized daily operational efficiency over reboot velocity. Once the device finishes its initial startup sequence, iOS 12 delivers noticeably smoother animations, improved multitasking, and reduced latency across both iPhones and iPads.