Junk files or temporary files slowly build up on any device as per the usage. Huge junk file pile up will consume more device performance as well as slight storage space. Generally the junk files occupy less space in the storage device, so when they are cleared you may not see massive disk space freed up, but you can see an enormous increase in the device performance.
By Using "One Click Maintenance" the unwanted junk files can be removed effectively. Using this feature you can boost the device performance rather than freeing up space on the storage media.