Computer users may have such experience. The speed of a computer is very fast when it is just turned on, and running programs are also more fluent. But after a while, the running speed and efficiency of various applications will obviously decrease. Then, the speed to open files or run corresponding programs will become slower and slower. This situation is especially obvious on some computers with older hardware configurations. In addition, even if users exit some large online games or applications that consume a lot of memory resources, it is difficult for the computer's running speed to improve significantly in a short period of time. Why is this?