iOS 26 lag and overheating issues on iPhone

Ever since updating to iOS 26.0, my iPhone has been lagging like crazy — app switching stutters, the whole system feels slower, and the phone even overheats sometimes. Apple says it’s just “indexing” and will settle after a few days, but it’s been over a week for me and nothing has changed.

[Edited by Moderator]

Original Title: Ios 26

iPhone 12, iOS 26

Posted on Oct 3, 2025 11:10 AM

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21 replies

Oct 4, 2025 8:09 AM in response to dipjyoti80

Which apps exhibit the lag you’re experiencing?

Oct 4, 2025 2:54 PM in response to Jeff Donald

Settings, whatsapp and messages

riza218

Level 1

8 points

Oct 24, 2025 4:39 PM in response to dipjyoti80

how can i reduce the glass liquid effect?

Malgunde

Level 1

14 points

Nov 22, 2025 10:43 AM in response to Community User

heting

problem, use video calling

iPhone 13 beta update 26.1

solve karay new update 18.7 please

Oct 4, 2025 1:18 AM in response to razmee209

I’ve already tried a bunch of stuff — turned on Reduce Transparency and Reduce Motion, updated to iOS 26.0.1, turned off Background App Refresh, and even kept my phone plugged in overnight for the past week so it could finish indexing or whatever. Still lagging and heating up tho

Oct 5, 2025 10:28 AM in response to tiww

Have you contacted Apple Support and run remote diagnostics on your iPhone? I’ve got a 17 Pro Max and it’s running great. I know that doesn’t help you, but makes me think diagnostics might turn something up.

If you’re within the return period maybe return it or swap it for a different unit.

If you’re in the US please call 1-800-MY-APPLE or outside the US, consult the support articles below. In Canada call 1-800-263-3394

Contact Apple for support and service - Apple Support

Genius Bar Reservation and Apple Support Options - Apple

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iOS 26 lag and overheating issues on iPhone