The actual mechanism of elections have never, so far as I know, been all that expensive pre-computation.
What? If anything I'd assume them to be more expensive before computers were introduced. In Italy where they are still paper based they have to hire people to count the ballots (and they have to pay them a lot, given that they select people at random and you're not allowed to refuse unless you are ill or something).
In the UK, the counters are volunteers.
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