Why the NBU 7.1.0.3 backup the Windows encryption folder slow than no encryption folder?

Hi experts

I ran into a situation when the NBU7.1.0.3 master server backup its folder "F:\3Dxx" into the VTL, the size of the folder is 1.4G, but the backup speed, elaspt time is different if I encrypt the folder.

The encrypt steps:

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