Why are video editing software so slow

[Dumb and Dumber]

If I take my DVD-recorder. It cuts video files and delete parts of videos in 2-3 seconds.
With my PC it takes very very long. I can't believe that the CPU of the DVD-recorder is much faster than that of the average home computer. Why must it take so long to be able to edit videos on your PC? Surely the software does exist to do it fast, how else can dvd-recorders do it so fast?

 

[Dingbat]

 

[Steerpike]

 

[scrarfussi]

 

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[Skylark]

 

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[Drukkie]

 

[Dumb and Dumber]

 

[Skylark]

 

[Dumb and Dumber]

 

[Skylark]

 

[Skylark]

 

[Drukkie]

 

[Drukkie]