[codethief]

I haven't done the actual math and I might be a few orders of magnitude off but shouldn't electrical resistance drop quite significantly in space, too? (Of course there's the other issue that information processing is an inherently dissipative process because entropy etc.)

[cguess]

How would electrical resistance drop in space? If you're thinking "because it's cold" that's actually the biggest issue. The vacuum means you can't dispose of heat easily, so you need giant radiators, which are expensive, heavy, etc.