The Mac Pro Late 2013 has a faster storage speed than most medium processor core PCs that were launched more than a year ago. This personal computer has an SSD storage medium, whereas most comparable spec PCs that have been on the market for around the same time as it 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 desktop computer's storage speed (SSD) is actually the best storage speed across all computers of this age and type.
The worst storage speed amongst comparable types of desktop computer is HDD.