That being said, I am amazed that anything more than a one-person distro isn't using distcc or similar to spread the compile load over a farm of machines.
Getting lots of ARM machines for this sort of thing is pretty easy, and power wise is far more efficient than any x86 machine. People make off-the-shelf boxes which have dozens of ARM SoC systems plugged into them. individually they are poor, but as a compile farm they would be very efficient (the final serialized link step would still be a bottleneck, but that's a small part of the overall CPU time)
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