Installing different applications on your phone can cause the function of your device to slow down immediately, and one of the reasons for that is the RAM space getting all used up.
Every application that gets installed, will start working on the background of android and this uses up a percentage of your gadget's RAM. This percentage is more on the applications that need access to the internet.
In order to manage the RAM space on your phone, you have many options available (task manager). One of the applications that give you the ability to free and manage a lot of your RAM space is ZDbox that can be downloaded and installed from Google Play.
Click on the Task Killer to go to the RAM section.
Now you can see and close other applications that are running on your system. You most probably know that the applications of the system are still running in the back ground, and they are taking up a lot of your RAM. In order to close them, follow the steps shown in the screenshots below.
From Now on, every time you turn your gadget's screen on and off, all your applications (on system and downloaded) will close so you can have more free RAM space.
Of course, you can also use the widget for this software to access these options a lot faster.