Du speed Booster - Free SYStem monitor

DU Speed Booster & Cleaner is a speed booster, ram booster, game booster, junk file cleaner, trash cleaner, memory booster, battery optimizer and app manager for your Android phones or tablet.
Trusted by 230 million users, DU Speed Booster is the only all-in-one speed booster, trash cleaner and antivirus app that optimizes your background apps, memory space, junk(cache) files and battery power. While keeping your device safe from virus and trojan, that can secure your private data with the AppLock function.