The time defragmenting takes

System resources are needed for every defragmenting operation. This can slow down your applications if you are defragmenting using other tools.

TuneUp Drive Defrag, on the other hand, puts the user first. If you start an application to work, play, or surf while TuneUpDrive Defrag is running, the defragmenting operation slows to release important resources for you. If no application is being used for the moment, TuneUpDrive Defrag continues defragmenting at the optimal speed.

Because TuneUp Drive Defrag: