Sabrent Rocket NVME SSD inside One-Netbook A1

Sabrent Rocket is one of the fastest NVME SSD series in the formfactor of M.2 2242. According to the manufacturer, "its speed performance can reach up to 2500MB/s read and 2100MB/s write" (ref).
Here is what you can expect from this SSD inserted into the One-Netbook A1 handheld computer:

It’s worth mentioning that the default One-Netbook SSD shows very similar performance.

So there is no reason to replace SSD in order to get higher speed. The default SSD is pretty much the best you can achieve.