> just to save a few miliseconds? RDRAND is rather slow, especially with the SRBDS microcode update. One instruction takes 1,200 ns on my system, that's 6.6 MB

> just to save a few miliseconds? RDRAND is rather slow, especially with the SRBDS microcode update. One instruction takes 1,200 ns on my system, that's 6.6 MB/s. A software implementation of a CSPRNG will do hundreds of MB/s, the general purpose PRNGs do several GB/s.