The Mac Pro Late 2013 has a faster storage speed than most desktop computers of a comparable age and spec to it. This Apple computer has an SSD storage medium, whereas most medium processor core computers that were released 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.
An SSD storage medium is in fact the best storage speed across all similar spec PCs that are a comparable age to the Mac Pro Late 2013.
Across comparable types of computer the worst storage speed is HDD.