WhatsApp for Xiaomi Mi 5c

MIUI runs a lot of background animations and preinstalled bloat that bog down the Mi 5c's modest hardware over time. Go to Settings > Additional settings > Developer options and set Window animation scale, Transition animation scale and Animator duration scale to .5x or off, then in Settings > Apps disable or uninstall preinstalled apps you never use. You can also turn off MSA and Analytics under Settings > Passwords & security > Authorization & revocation to cut background overhead. See how others solved this on Reddit

MIUI's aggressive battery saver restricts the data connection for backgrounded apps and can drop the radio during deep sleep. Go to Settings > Battery & performance > App battery saver, find the affected apps and set them to No restrictions, and disable MIUI optimization in Developer options. As a quick recovery when data drops, toggle Airplane mode on and off, or switch the preferred network type under Settings > SIM cards & mobile networks. See how others solved this on Reddit

MIUI removed the classic Android recovery 'wipe cache partition' option, so there is no single button to clear system cache. Instead open the preinstalled Security app > Cleaner to sweep junk and cached files, and clear individual app caches under Settings > Apps > Manage apps > [app] > Clear data, then choose Clear cache. For a misbehaving app, clearing its cache this way usually fixes the issue without a factory reset. See how others solved this on Reddit

Most ads come from MIUI's built-in 'recommendations' that you can switch off individually. Go to Settings > Passwords & security > Privacy > Ad services and turn off Personalized ad recommendations, then open each system app (Security, Downloads, File Manager, Mi Browser) and disable 'Receive recommendations' in its settings. Also turn MSA (msa.apk) authorization off under Settings > Passwords & security > Authorization & revocation to stop the system-wide ad push. See how others solved this on Reddit

The Mi 5c is long past its update window and no longer receives MIUI or Android security patches, which leaves known vulnerabilities unpatched. Stay protected by installing apps only from Google Play (avoid sideloading), keeping Play Protect on under Play Store > Profile > Play Protect, and updating critical apps like your browser and messaging apps, which still ship their own fixes. For longer-term safety, consider a community ROM such as LineageOS, which still provides newer Android security baselines for this device. See how others solved this on Reddit

China-ROM Mi 5c units ship without Google Play and with China-only defaults, so banking and Google apps may not work out of the box. The cleaner fix is flashing the Global MIUI ROM (or LineageOS) via fastboot, which includes Google services and the correct band/APN settings for your region. If you keep the China ROM, you can manually install the Google Play Store and set your carrier APN under Settings > SIM cards & mobile networks > Access Point Names, but expect some preloaded Chinese apps to remain. See how others solved this on Reddit