WhatsApp for Realme GT 2 Pro

ColorOS aggressively closes background apps to save power, which delays or blocks WhatsApp notifications. Go to Settings > Battery, tap WhatsApp under the app list (or Settings > Apps > App management > WhatsApp > Battery usage) and set it to Allow background activity / Don't optimize. Then open Settings > Apps > Auto launch (App auto-launch) and enable it for WhatsApp. Finally, in Settings > Notifications & status bar > Manage notifications > WhatsApp, confirm all notification categories and Banners are turned on. See how others solved this on Reddit

ColorOS freezes WhatsApp when the screen is off, so messages only sync when you reopen it. Lock WhatsApp in Recent apps (open the recents view, swipe down on the WhatsApp card or tap the menu and choose Lock) so it stays in memory. Then enable Auto launch for WhatsApp under Settings > Apps > Auto launch, and set Battery usage to Allow background activity in Settings > Battery > WhatsApp so messages push in real time. See how others solved this on Reddit

Lag is usually caused by a heavy ColorOS update or built-up cache rather than the hardware. First clear cache for the worst-offending apps via Settings > Apps > App management > (app) > Storage usage > Clear cache, and free up internal storage. You can also reduce Window, Transition, and Animator durations to 0.5x under Settings > About device > Version (tap Build number to enable Developer options) > Additional settings > Developer options. If it persists, back up your data and do a factory reset via Settings > System settings > Reset phone, since WhatsApp chats can be restored from your Google Drive backup. See how others solved this on Reddit

The GT 2 Pro's long screen-on time mainly comes from taming the high-refresh display and background sync. Lower the refresh rate via Settings > Display & brightness > Screen refresh rate to Auto select (or Standard 60Hz), and enable Settings > Battery > High performance mode only when needed; turn on Super power saving mode when low. For WhatsApp, turn off media auto-download under WhatsApp > Settings > Storage and data so it isn't constantly waking the phone. See how others solved this on Reddit

This is the wake-on-notification behavior in ColorOS. Go to Settings > Notifications & status bar and turn off Turn on screen when notifications are received. To stop notifications appearing on the lock screen / Always-On Display, go to Settings > Notifications & status bar > Notifications on lock screen and disable it (and turn off new-notification display under the Always-On Display settings). WhatsApp alerts will still show in the status bar without the whole screen lighting up. See how others solved this on Reddit

Owners generally find it solid for daily messaging on its Snapdragon 8 Gen 1 chip, but the common complaints are ColorOS notification delays and preloaded bloatware. After setup, set WhatsApp's Battery usage to Allow background activity (Settings > Battery > WhatsApp) and enable Auto launch for it, then uninstall or disable preloaded apps via Settings > Apps > App management to free RAM. With those tweaks, WhatsApp calls and chats run reliably. See how others solved this on Reddit