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Note that mechanical computers aren't the only alternative to electric computers, biological computing is another area of active research:

https://en.wikipedia.org/wiki/Biological_computing

Speed and cooling might be less of an issue considering the scale which biological processes operate.

Although biological computing sounds a lot like just doing everything by hand:

https://xkcd.com/2173/

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For many years I've wanted to build a digital clock out of fluid gates. The medium would be clear water; the 7-segment display would consist of transparent tubes, into which stained oil is pushed to activate a segment. I think a gate would probably be some kind of vortex. I've never tried to build it, because

- I don't know anything about fluid mechanics

- The 'exhaust' is water, so I could only really operate this thing in the bath

You can't get biological computers without having very high speed computers though. This field of biology is very reliant on computer analysis.

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