WhatsApp for Apple

Several users report choppy scrolling and slow chat-opening on the 17 Pro running iOS 26, which points to a WhatsApp build not yet optimized for the new OS. First update WhatsApp: open the App Store, tap your account photo in the top-right, scroll to the list of pending updates and update WhatsApp (or use the search tab to find it and tap Update). Then swipe WhatsApp closed from the App Switcher and reopen it. If it still lags, delete the app and reinstall it from the App Store, then restore your chats from your iCloud backup when prompted during setup. See how others solved this on Reddit

After an iOS update, force-close WhatsApp by swiping it away in the App Switcher, then reopen it, and check the App Store for a pending WhatsApp update since post-iOS releases often need the matching app build. If it still misbehaves, restart the iPhone 16 Plus (hold the Side button + either Volume button, then slide to power off) and confirm WhatsApp has Background App Refresh and Notifications enabled under Settings > Apps > WhatsApp. See how others solved this on Reddit

Lag is usually a bloated local database, so open WhatsApp Settings > Storage and Data > Manage Storage and clear large forwarded videos and media-heavy chats. Then force-close the app (swipe up from the bottom and flick WhatsApp away), make sure both iOS and WhatsApp are fully updated in the App Store, and reboot the phone. If a single chat scrolls slowly, clearing that chat's media or archiving it typically restores smooth performance. See how others solved this on Reddit

This is usually a WhatsApp build that isn't yet optimized for iOS 26 and the A19 Pro chip, so make sure you're on the latest version from the App Store and that iOS itself is current under Settings > General > Software Update. If it still stutters or freezes, force-close WhatsApp from the App Switcher and clear oversized media via WhatsApp > Settings > Storage and Data > Manage Storage, since bloated caches are the most common cause of the lag on this model. A restart of the phone after updating also clears the problem for most people. See how others solved this on Reddit

Most stutter and freezing on the 16 Pro traces back to an outdated app build or a stale cache after an iOS update. Update WhatsApp in the App Store, then force-quit it (swipe up from the bottom and flick the card away) and restart the phone; if it persists, offload it via Settings > General > iPhone Storage > WhatsApp > Offload App and reinstall, which clears the app's cache without deleting your chats. See how others solved this on Reddit

This is a known WhatsApp/iOS 26 issue, not a fault with the Air's hardware. First force-close WhatsApp: swipe up from the bottom edge and pause in the middle to open the App Switcher, then flick the WhatsApp card up. Update to the latest build from the App Store, since recent releases have targeted the sluggishness. If it persists, go to Settings > General > iPhone Storage > WhatsApp and tap Offload App, then reinstall from the App Store to clear a bloated cache without losing your chats (your messages stay backed up in iCloud). See how others solved this on Reddit

This is usually a network or carrier handoff issue. First go to Settings > WhatsApp and make sure Cellular Data is enabled, then toggle Airplane Mode on for about five seconds and off again to force a fresh connection. If it persists, go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings, which clears stuck carrier, DNS and VPN states without deleting your chats (you will need to re-enter Wi-Fi passwords afterward). See how others solved this on Reddit

Open Settings > Notifications > WhatsApp and make sure Allow Notifications, Lock Screen, Banners and Sounds are all on, then check Settings > Focus to confirm no Focus or Do Not Disturb mode is silencing it. Next open Settings > WhatsApp and turn on Background App Refresh so the app can receive messages and calls while it is closed. If calls still do not ring, confirm WhatsApp is allowed under Settings > Cellular and that Low Power Mode (Settings > Battery) is off, since it throttles background delivery. See how others solved this on Reddit

This is usually caused by iOS 26's background and battery management cutting WhatsApp's network access. Go to Settings > WhatsApp and make sure Background App Refresh, Local Network, and Cellular Data are all turned on, then turn off Low Power Mode in Settings > Battery, since it throttles background activity during calls. If it still drops, update WhatsApp from the App Store, as several disconnect bugs were patched in builds released after the iPhone 17 launch. See how others solved this on Reddit

Force-close WhatsApp by swiping it away in the App Switcher, then open the App Store, tap your profile picture, and update WhatsApp to the latest build that's compatible with your current iOS version. If it still crashes, restart the phone and confirm iOS is fully updated under Settings > General > Software Update, since these break-after-upgrade issues are almost always fixed by a paired app-and-OS update. See how others solved this on Reddit