The D 5700BA has a faster storage speed than most few processor core computers that are a similar age to it. This Shuttle PC has an SSD storage medium, whereas most computers of this age and type have an HDD storage medium. Solid State Drives (SSD) store information in transistors on a circuit board rather than on optical or magnetic media. This has the advantage of being much faster than a traditional HDD drive.
This PC's storage speed (SSD) is in fact the best storage speed amongst all PCs of this spec and age.
The worst storage speed amongst comparable types of PC is HDD.