Most people don’t know that defragmenting their computer hard drives can significantly boost performance, especially on older computers or if you haven’t defragged in a very long time. Data gets stored in bits and pieces all over your hard drive and this gets worse as time goes on, as files get written or modified. So now your hard drive is looking all over the place to read a file which slows it down. Defragmentation puts those bits back together, right next to each other so reading that file now becomes faster.