The best optimization tool. This is former Smart RAM Booster.

Highlights of Smart Booster
► Smart RAM Booster: small widget to adaptively boost RAM from anywhere
► Fast cache cleaner: one click to clean cache
► Quick SD Card cleaner: efficiently scan and clean junk created by million apps
► Advanced application manager: optimize your devices by hibernate, disable, auto-start apps

Recommended by AddictiveTips. Hotest Apps by AppBrain.

Smart RAM Booster
The most beautiful part of this app is a small, configurable widget that places on top of any app and one-click to RAM boost.
Most of Android devices bundle with limited memory. Android task manager will selectively kill low priority tasks in order to
reserve memory to higher priority task. That's not always run at an appropriate time, causing low responsive apps, lagging,
especially when you launch a new app after heavily browsing web pages. It causes a worse experience.

RAM Booster comes with auto-boost in 4 levels: aggressive, strong, medium, gentle.

☆ Aggressive: kill most of low priority apps
☆ Strong: Kill apps that is low priority as well as consume lightly below an “average”
☆ Medium: kill apps that consumes memory above an “average”
☆ Gentle: kill only apps that uses considerable memory

There are 5 ways to boost
☆ Auto-boost: boost automatically under RAM available & timing conditions
☆ Overlay widget – Enable RAM Booster overlay widget (on by default), adjust widget's position, and tap on widget to boost anytime you want
☆ Home screen widget – one tap to boost (long-press your home screen>Widget to add RAM Booster widget)
☆ Notification bar – one tap to boost (toggle notification bar visibility in app's setting)
☆ Boost Now – tap this button from app's main screen

Fast cache cleaner
☆ 1-click to clean cache
☆ Show detail internal cache and external cache
☆ Select apps that use most cache

Quick SD Card cleaner
☆ Show SD card partition
☆ Scan for junk folder, big files, orphaned files
☆ Nice photo cleaner, music cleaner
☆ Notify for low storage usage

Advanced application manager
☆ Easily backup, uninstall unused apps
☆ App2SD - recommend apps to move to sd card
☆ Hibernate rarely used apps to save battery
☆ Disable system apps
☆ Scan auto-start apps
☆ Manage backup (.apk) files

This app uses the Device Administrator permission.