Samsung SM-T285YD - Using the quick optimisation feature; Managing device performance

Applications
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Battery
Check the remaining battery power and time to use the device. For devices with low battery
levels, conserve battery power by activating power saving features and closing apps that are
consuming an excessive amount of battery power.
The usage time left shows the time remaining before the battery power runs
out. Usage time left may vary depending on your device settings and operating
conditions.
Storage
Check the status of used and available memory capacity. You can delete unused and residual
files or uninstall apps that you do not use any more.
RAM
Check the amount of available RAM. You can close background apps and reduce the amount
of RAM you are using to speed up your device.
Device security
Check the device’s security status. This feature scans your device for malware.
Activating ultra data saving mode
Monitor and reduce your mobile data usage by preventing background apps from using the
mobile data connection. You can also use the data compression feature to compress Internet
data, such as images, videos, and webpages, accessed via the mobile network.
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This feature may not be available depending on the region or service provider.
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Some webpages or content may not be available when this feature is activated,
depending on the service provider or the mobile network conditions.
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Tap Smart Manager on the Apps screen.