@Patrick  I did one more test with my "home made parallel processing using systask" code  (basis was materials from my old parallel-systask training: https://pages.mini.pw.edu.pl/~jablonskib/SASpublic/Parallel-processing-in-BASE-SAS.sas)   I managed: - with 5 parallel sas sessions I managed to reduce hash-table processing to 26.54 sec. - with 4 parallel sas sessions I managed to reduce hash-table processing to 31.995 sec. - with 5 parallel sas sessions I managed to reduce array processing to 4.831 sec. - with 4 parallel sas sessions I managed to reduce array processing to 5.551 sec. - with 3 parallel sas sessions I managed to reduce array processing to 7.005 sec.   I think SSD drives did the most "speed boost" but I dare to say "not bad for a laptop" 😉   Bart       ... View more