How to quickly optimize my Samsung Galaxy A8 (device maintenance tools)

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The Samsung Galaxy A8 has a device maintenance feature. You can get an overview and quickly optimize the battery, storage, RAM and system security on your device.
1. Swipe up or down to view Apps.
2. Touch Settings.
3. Touch Device maintenance.
4. Touch a category to get more information (Battery, Storage, Memory or Device security).
5. Touch the Back icon to return to the previous screen.
6. Touch OPTIMIZE NOW to quickly optimize and improve device performance. The Samsung Galaxy A8 will delete unnecessary files, close apps running in the background, and scan for malware and phishing attacks.
7. Touch DONE.
8. The Samsung Galaxy A8 has been optimized.