Performance: time to generate 10 million 32-bit integers


          0.48   Math::Random::MTwist  irand32
          0.50   int(rand(4294967296))
          1.70   Math::Random::MT::Auto
          3.77   Math::Random::MT

          1.58   Math::Random::ISAAC::XS     seed by hand
          3.22   Crypt::Random::Seed         composed from /dev/urandom
          3.70   Math::Random::ISAAC         seed by hand
          6.00   Crypt::PRNG::RC4
          6.19   Bytes::Random::Secure
          6.37   Crypt::PRNG::Sober128
          6.60   Crypt::PRNG::Yarrow
         12.1    Crypt::PRNG::Fortuna
         18.7    Math::Random::Secure

       1194      Crypt::Random               Pari has so much overhead

      27000      Crypt::Random::TESHA2       userspace is slow....