Found it :-) This is a Python bug: https://bugs.python.org/issue26839
Sorry for cross posting to the three bugs. I don't know, how/wether these 3 bugs should those been merged. Martin/Matthias, can you handle this ? ----- How I found it: The first line I get in dmesg after typing something at the keyboard is "random: nonblocking pool is initialized" systemd-cron does uses Python's hashlib to compute md5's; but that doesn't need any source of randomness at all. Now I see even an empty python program with only the shebang line would still trigger this delay; so this had to be a python runtime related bug. Alexandre
