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There really isn't exactly a "first" computer. Some of the really early ones:

  • Harvard Mark I - 3 operations per second
  • ABC - 30 additions/subtractions per second
  • ENIAC - 5000 additions/subtractions per accumulator per second
  • Zuse Z3 - roughly 1 to 3 operations per second
  • Colossus - roughly 5000 enciphered characters per second
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