Screen savers may look pretty, but they do it when no one is looking. When you enable Battery Saver mode, Android throttles your phone’s performance, limits background data usage, and reduces things like vibration in order to conserve juice. FLIP CLOCK SCREENSAVER WINDOWS 10 ANDROID
You can turn on Battery Saver mode at any time. Just head to Settings, Battery, and then Battery Saver.
Once there, tap Turn on now to enable it. Go to “Settings” and click on “Personalization”. On the Left hand click on “Lock screen” option.