How is the Sandevistan supposed to work in Cyberpunk lore?

In the lore it's cyberware that boosts your nervous system, it speeds up how fast you react and process what's happening, so to you the world seems to slow down. The catch is the strain on your body and mind, long or constant use is tied to cyberpsychosis, which is basically the whole point of David's story in Edgerunners. In 2077 it's an operating system slot, so you can't run it and a cyberdeck at the same time.