On Saturday, 3 August 2019 at 17:44:44 UTC, lithium iodate wrote:
On Saturday, 3 August 2019 at 16:35:34 UTC, Giovanni Di Maria wrote:

First off you could try to use a faster RNG engine than the default. The easiest way is to define a variable containing it and passing it to the functions each time.

auto rng = Xorshift(1234);
randomNumber = uniform!uint(rng);

This basic change approximately halved the 5 seconds your original example needs on my computer. Another simple approach that I have tried is simply hashing the iterator using a fast hash function. With xxHash32 I got the time down to 0.25 seconds. I also tried xxHash64 and FNV1a but they were not faster in my quick test.

Thank you very much Lithium Iodate
Now i will try it.
I let know you.
Thank you

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