The OptiPlex 9020M has a faster storage speed than most comparable spec computers that have been available for a similar time to it. This desktop computer has an SSD storage media, whereas most computers that were released more than two years ago have an HDD storage media. 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 in fact the best storage speed amongst all computers that have been available for around the same time as the OptiPlex 9020M.
The worst storage speed across similar types of desktop computer is HDD.