[jerf]

I classed that in with doing GPU computations in JS; it may work in a carefully selected browser and GPU combo today, but it's going to be a while before it's out there.

And even if your JS is running at native speeds, it doesn't solve the bandwidth problem, which is nowadays arguably the distinguishing characteristic of a supercomputer, since the compute nodes of a supercomputer are hardly any faster than a commodity desktop anymore. (Some, yes, sure, but nowhere near the multiples there used to be.)