The Twist S230u has a better storage medium than most notebook PCs of a similar age and type to it. This Lenovo laptop has an HDD storage media, whereas most notebook PCs that were released more than two years ago have an SSD storage media. 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.
An HDD storage media is actually the worst storage medium amongst all 2 in 1 laptops that have been around for around the same time as the Twist S230u.
Amongst comparable types of portable PC the best storage medium is SSD.
If the storage medium of this Lenovo laptop is too bad for you then you might want to look at the Toshiba U920t (SSD) which is also higher rated.