WhatsApp for Realme GT Neo 5

Realme's ColorOS aggressively kills background apps to save battery, which delays or blocks WhatsApp messages until you open the app. Go to Settings > Battery, tap the three-dot menu (top right) > App battery management (or open Settings > Apps > WhatsApp > Battery usage), find WhatsApp and enable Allow background activity and Allow auto-launch. Then open Settings > Apps > WhatsApp > Notifications and confirm all categories are enabled, and lock WhatsApp in the Recent apps screen by pulling its card down and tapping the lock icon so the cleaner won't evict it. See how others solved this on Reddit

This usually happens when the app's theme and the system theme are mismatched, leaving the on-screen navigation bar a bright white. First set WhatsApp to follow the system by opening WhatsApp > Settings > Chats > Theme > System default, then enable system dark mode under Settings > Display & brightness > Dark. If the solid bar still appears, switch to full gesture navigation under Settings > Convenience aids (or System settings) > System navigation > Gestures, which removes the solid bar entirely. See how others solved this on Reddit

The Always-On Display only shows new-notification icons while AOD is active and the app is allowed to post notifications, and ColorOS does not render an icon for every chat app depending on the AOD style. Turn AOD on under Settings > Wallpapers & style > Always-On Display (on some builds it is under Settings > Convenience aids / Special features), and make sure WhatsApp notifications are permitted under Settings > Apps > WhatsApp > Notifications. If your AOD style still shows no app icons, switch to a different AOD style, since some clock-only styles never display notification icons. See how others solved this on Reddit

Despite the large RAM, ColorOS's memory manager and battery saver still purge cached apps, so WhatsApp reloads and misses messages. Allow it to run in the background under Settings > Battery > App battery management > WhatsApp > Allow background activity, and turn off Settings > Battery > Power Saving Mode and any sleep/standby optimization. Avoid using the built-in RAM cleaner or clearing all apps in Recents, as those are what evict WhatsApp from memory. See how others solved this on Reddit

Over time cache buildup and full storage make apps like WhatsApp feel sluggish. Clear WhatsApp's cache via Settings > Apps > WhatsApp > Storage usage > Clear cache (this does not delete your chats), and reduce visual lag by enabling Developer options (tap Settings > About device > Version > Build number seven times) and lowering Window animation scale and Transition animation scale to 0.5x. Keeping the system updated under Settings > Software update and keeping internal storage below about 80 percent full also restores responsiveness. See how others solved this on Reddit