I don't think so. Think about the time it takes for neurotransmission to occur. Fractions of a second. Speeding that up? Even if you could cut the time in half we're talking about such small increments of time that it'd likely be undetectable to the human eye. It makes you more attentive. To everything. Also makes fatigue less of an issue. That's why college kids cram the stuff around finals. They can power through hours and hours of studying without feeling tired at all. It doesn't speed up thought processes, as far as I know. It simply allows the person to focus a far greater amount of their mental capacity at a specific task and for a far greater duration than would be normally achievable.