In reply to Rick Wicklin.

Thanks for responding! I mainly use random numbers to do random sampling without replacement in a DATA step, as seen in http://blogs.sas.com/content/sastraining/2015/09/04/random-sampling-whats-efficient/

I'm trying to understand if the old algorithm is really so bad at, say, sampling ten million rows down to a random hundred thousand that I need to use the new function and wait longer for the output.