Following a major software update, users often notice their devices feeling unexpectedly sluggish, and the rollout of iOS 27 appears to be no exception—affecting even the latest iPhone 18 Pro.
While reduced performance on a brand-new flagship can be concerning, it is generally normal behavior right after an installation. A major operating system update initiates heavy background tasks, including file indexing, photo library processing, and app data migrations, all of which place high demands on system resources.
These initial slowdowns are temporary and typically resolve on their own within a few hours or days once background operations are complete and the device returns to regular operation.
For an in-depth breakdown of this performance behavior, check the original source at AppleInsider for full details.
