"In gadgets like cell phones, its frozen-in-place nature means lightning-fast bootup times--instantaneous, even."

It all comes down to digital signal recovery, or the footprint to be programmed. Its the infrastructure of read/write/erase(or the cell programing considerations) and not necessarily the melt / freeze characteristics of crystalline, or the trapping characteristics of electrons.

"Matthias Wuttig, a physicist at RWTH Aachen University in Germany, has developed PCM cells that can switch on in 19 nanoseconds"

Great, now all she has to do is match the cells with programing infrastructure.....and then see how that combines with status quo interface computing(of which there are many, e.Digital being one for serialized considerations) characteristics to get the real end result.

For e.Digital....it does not matter if the cell characteristics are crystalline or electron.

doni