As I understand one of the limiting factors for high-speed cpu's today is that there is a lot of unwanted capacitance in the wiring, which puts an upper limit on how fast they can switch from 1 to 0 (and vice versa).

One way to make it switch faster is to increase the voltage so it takes less time to charge the capacitor, but this increases the power usage.

So I very much doubt that it would work well adding even more capacitance to the circuit