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iPhone 15 Overheating and Slowing Down – Performance & Heat Fix
Cool down your device and restore peak performance
Symptoms
- ✓ Phone gets hot during simple tasks
- ✓ Performance drops when warm
- ✓ Lag while charging
- ✓ Heat during gaming or video calls
- ✓ Hot from 2% → 60% charging
- ✓ Issue started after iOS 26 update
Common Causes
- Background indexing after setup
- iOS 26 thermal bugs
- Gaming while charging
- 5G + hotspot + Bluetooth + location = heat stack
- High brightness increasing heat
- Case trapping heat
Quick Fixes
1. Remove the Case Temporarily
Cases trap heat and slow down the phone.
2. Lower Brightness
High brightness increases heat and throttling.
3. Avoid Gaming While Charging
This is the #1 cause of overheating on iPhone 15.
4. Turn Off Background App Refresh
Settings → General → Background App Refresh → Off.
5. Restart the Device
Resets thermal and performance processes.
Advanced Solutions
1. Reset All Settings
Fixes corrupted thermal and performance preferences.
2. Update to Latest iOS
Later iOS 26 builds improve thermal management.
3. Switch to LTE Instead of 5G
5G increases heat and battery drain.
4. Avoid Using Hotspot for Long Periods
Hotspot generates significant heat.
FAQ
Why does my iPhone 15 get hot during setup?
Indexing and background tasks run heavily for the first 24–72 hours.
Is overheating normal while charging?
Yes — especially from 2% → 60%.