Win10 system prompts insufficient memory how to do

Although the computer is now equipped with more and more memory, 4GB has become a common memory specification for computers. However, in the use of systems including Win10, sometimes the system prompts that the memory is insufficient. Why is this, what should I do?
This situation may be that there are too many programs running in the system. Take up a lot of memory, or an application monopolizes too much memory, such as AutoCAD. It is also possible that virtual memory is not enabled and causes insufficient memory.
This happens, after confirming that the system is not running redundant programs (especially pay attention to the programs running in the background), check if the system has closed the virtual memory. You can take the system default state and set the virtual memory to system hosting.
With the support of virtual memory, the pressure on the physical memory of the tasks on the Win10 system can be alleviated to some extent, and sometimes the system can obviously feel faster. Of course, in addition to turning on virtual memory, you should also avoid memory being used by redundant programs.