Windows uses a memory-management technique known as to monitor which applications you use most frequently an d then preloads them into your system memory.

SuperFetch

Explanation:  SuperFetch is the service that is provided to increase the responsive speed of the system  and the application to work relatively faster with accuracy.This service is generated by the Windows for the better functioning of the applications.

It reduces the work functioning of the system by already preparing the application to launch the programs which are being used by the user  frequently  into the random access memory. This initially helps the programs or application to be post-loaded.