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....