Samsung GALAXY S6 User Manual page 218

Quick Optimization
The quick optimization feature improves device performance through the following actions:
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Identifying apps that use excessive battery power and clearing unneeded items from memory.
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Deleting unnecessary files and closing apps running in the background.
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Scanning for malware.
To use the quick optimization feature:
1. From home, tap Apps
2. Tap Smart Manager
Settings
> Settings .
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