answersLogoWhite

0

Over a period of time as some programs are downloaded and others are deleted; your hard drive becomes fragmented with "loose ends" of old programs and when new programs are added, your CPU will stuff parts of the new program into various spaces all over your hard drive. This has the effect of making your CPU work harder when said program is called up. Thus, slowing down the overall performance of your computer. By doing a disk cleanup (defragging), your computer can delete these loose ends and re-position your programs together on your hard drive so that the CPU doesn't have to search all over the disk for a particular program when it is called up.

User Avatar

Wiki User

13y ago

What else can I help you with?