I think Linux has recently seen quite a lot of work on speeding up its PRNGs but something similar to what you proposed didn't end up making it into the kernel

I think Linux has recently seen quite a lot of work on speeding up its PRNGs but something similar to what you proposed didn't end up making it into the kernel due to a few issues, and I think at the time it ended with this : "Linus Torvalds, though, argued that none of this effort was worth it. Speeding up random-number generation, beyond a point, is not the kernel's job, he said; instead, that should be left to the C library." https://lwn.net/Articles/919008/ https://lwn.net/Articles/919008/ I've not been following the mailing lists so I don't know if that ever changed since then. The dev (Jason Donenfeld) seemed to think there was a way to get it working without the issues that blocked the improvement from getting merged last time though.