This also depends on the purpose of your RNG usage. Just this week, for example, I needed one to select a pseudo-random set of documents (out of 400,000) to pass them to human reviewers for inspection. For such a task, I don't care at all if it's cryptographically-strong or not, I simply use libc's rand(). I don't even care that it's very slow, getting the data for these 400,000 documents out of the database and generating/formatting them already needed enough time...
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