The Mac Mini Late 2014 has an SSD storage medium which is faster than most medium processor core PCs that have been around for more than two years. Most medium processor core PCs that have been on the market for a similar time to 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 personal computer's storage speed (SSD) is in fact the best storage speed across all personal computers of a similar age and type to the Mac Mini Late 2014.
The worst storage speed across comparable types of personal computer is HDD.