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Why iOS 27 slows down even the new iPhone 18 Pro at first

AppleInsider • Mon, 28 Sep 2026

Why iOS 27 slows down even the new iPhone 18 Pro at first

All iPhones are slower than you'd expect when they are new or when you've updated iOS, and Indexing is generally the culprit. Here's exactly what's happening and what you can do about it. While indexing is continuing, you'll see "Optimising Search and Siri" in Settings. Not to drag this out, the short answer is that all you absolutely have to do to speed up your iPhone is wait. You can help it along a bit, but the iPhone is indexing all of the data you've got on it and when that's done, it won't be so slow anymore. In fact it will feel especially fast, because then whenever you search your emails or look for a file, the iPhone has it indexed and will take you straight to it. This has always been the case with Spotlight searches, and it's now also because of Sir AI . Continue Reading on AppleInsider | Discuss on our Forums

What happened?

All iPhones are slower than you'd expect when they are new or when you've updated iOS, and Indexing is generally the culprit. Here's exactly what's happening and what you can do about it. While indexing is continuing, you'll see "Optimising Search and Siri" in Settings. Not to drag this out, the short answer is that all you absolutely have to do to speed up your iPhone is wait. You can help it along a bit, but the iPhone is indexing all of the data you've got on it and when that's done, it won't be so slow anymore. In fact it will feel especially fast, because then whenever you search your emails or look for a file, the iPhone has it indexed and will take you straight to it. This has always been the case with Spotlight searches, and it's now also because of Sir AI . Continue Reading on AppleInsider | Discuss on our Forums

Story details

All iPhones are slower than you'd expect when they are new or when you've updated iOS, and Indexing is generally the culprit.

Here's exactly what's happening and what you can do about it.

While indexing is continuing, you'll see "Optimising Search and Siri" in Settings.

Why it matters

This page keeps Apple rumors separate from official updates, so readers can follow early reports without confusing them with confirmed announcements.

Original source

https://appleinsider.com/articles/26/09/28/why-ios-27-slows-down-even-the-new-iphone-18-pro-at-first?utm_source=rss