SwapIt RAM Expander is an extremely usefulAapp which can speed-up your Android device within a few seconds. It will create a swap file by using a portion of your SDcard space and this portion will act as the RAM for your device.
There are other methods like RAM Manager and the V6 supercharger script to speedup Android. However, there was no noticeable difference in the performance of the phone using the RAM Manager. While the V6 supercharger script is very useful, it is a tedious procedure and the Android may get stuck at the boot after you reboot for the first time. In contrast, it is very easy to install and use the SwapIt RAM Expander.