@maddiefuzz @colin_mcmillen I'd never timed it, but I'd believe your estimate. Serious 32-bit math on an 8-bit accumulator architecture doesn't come easy. I'd held out a little hope on the iigs, given it's 16-bit and had accelerators available, but I think the only way this would ever work is the crypto done in hardware.
I did consider a general purpose socket proxy, too, but just kinda lost steam. Really happy to see someone keeping the green phosphors burning!