Many iPhone users who recently updated to iOS 26 are reporting serious performance issues — laggy animations, slow unlocking, delayed touch response, and general sluggishness across the system. Whether you’re using an iPhone 13 or even the latest iPhone 17 Pro Max, you’re not imagining it — this seems to be a widespread problem.
We recently covered a similar issue affecting macOS Tahoe, where many Mac users reported sluggish performance and stuttering animations after updating.
The issue:
- iPhones feel noticeably slower and choppier after iOS 26 update.
- Animations stutter when swiping, opening Control Center, or pulling down Notification Center.
- Face ID and screen unlocking take a few seconds longer than before.
- Apps — especially Safari, Camera, and Messages — lag or flicker when launching.
- Battery drains faster, and some devices even overheat during light use.
- Low Power Mode makes things even worse for some.
Why iOS 26 is slow:
- Background Indexing: After a major update like iOS 26, your iPhone re-indexes Spotlight search, Messages, and Photos (for visual recognition). This process can make your device run hot and feel sluggish for 1–3 days.
- Apple Intelligence Integration: The new AI-based features in iOS 26 rely on background data preparation. Even if you don’t actively use them, they can temporarily increase CPU load.
- Liquid Glass UI Effects: The redesigned "Liquid Glass" visuals demand more from the GPU. Users with older or even current-gen models say these effects introduce micro-stutters. There are ways to turn off some of the Luquid Glass effects.
- Low Power and Adaptive Modes: Ironically, enabling these modes can throttle the phone too aggressively, reducing frame rates and responsiveness.
- Storage and Heat: Devices with little free space (less than 15–20%) tend to perform worse because background tasks can’t complete properly.
How to fix slow iOS 26 on iPhone
- Wait for indexing to finish: Leave your iPhone plugged in and on Wi-Fi overnight for a couple of days. Many users reported smoother performance after 48–72 hours.
- Turn off Low Power Mode: Go to Settings > Battery > Low Power Mode > turn it off.
- Disable Apple Intelligence (if available): Go to Settings > Siri & Intelligence, and switch it off temporarily.
- Free up storage: Make sure at least 10–15 GB of space is available. Go to Settings > General > iPhone Storage to review large apps and videos. You may also consider buying additional iCloud storage, especially if your iPhone is running low on free space — limited storage can slow down indexing and system performance after major updates, like iOS 26.
- Reduce Transparency & Motion: Tap Settings > Accessibility > Display & Text Size > Reduce Transparency > ON. And then go to Settings > Accessibility > Motion > Reduce Motion > ON and enable Prefer Cross-Fade Transitions.
- Restart or Force Restart your iPhone: Press Volume Up and Volume Down and then hold the Side button until the Apple logo appears.
- Reset All Settings (without erasing data): Go to Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings: Doing so will reset all system preferences to their defaults without deleting your personal data like photos, apps, or messages. This article explains what exactly occurs.
- Update all apps from the App Store: Some third-party apps may perform poorly until updated for iOS 26.
- Disable unnecessary VPN profiles: Several users noted lag improved after removing old VPN or configuration profiles. Read this article to learn if you need a VPN.
- Install the latest iOS 26: Apple’s first minor update slightly improved heat and battery behavior for many users.
