The Flex 3 15 has an HDD storage medium which is better than the SSD storage medium found on most 2 in 1 laptops that are a comparable age to it. HDD is a traditional storage drive which stores the information on magnetic disks. HDD drives are slower than other forms of storage such as solid state drives (SSD) and flash drives.
This portable PC's storage medium (HDD) is actually the worst storage medium across all similar spec laptops that were launched around the same time as the Flex 3 15.
The best storage medium amongst similar types of portable PC is SSD.
If you would prefer a notebook PC with a better storage medium then you might want to look at the HP 13-r100dx (£926.71) (Hybrid-HDD).