Swapper for Root is an app which allows you to temporarily move tasks from the RAM to the storage. This will give you more memory to do your work. This will solve the problem of the phone not being able to handle the tasks simultaneously. You will not need to buy a new phone because of the performance issues.

When the memory is full, the phone may freeze. In order to solve this, you need to get Swapper for Root installed. This application will temporarily  move the unused tasks from the memory to the storage. This application does not need to connect to the computer in order to do this.

Once you download it, you can start using it. You just need to provide the path where you want to move the tasks. Once you start using the application, you will see the tasks in the storage. This application can work on all Android phones.