Hi, the SAGE consultant was noticing the network latency on the "internal switch". He did not like VirtualBox + FreeBSD for that matter (I don't blame him - it was the first "get something up" quickly" configuration). Here the values: --- SageApp.vv.fda ping statistics --- 10 packets transmitted, 10 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 0.308/0.635/1.364/0.319 ms It did not change much when moving to another network card (following David Lutz' recommendation: https://dlutzy.wordpress.com/2012/04/23/performance-problem-with-virtualbox/ ) However, there is a Windows box on the Oracle VM Server running, and here I have: --- SageWindows.vv.fda ping statistics --- 10 packets transmitted, 10 received, 0% packet loss, time 9002ms rtt min/avg/max/mdev = 0.554/0.605/0.646/0.037 ms So the average is not much different but the variance higher. However, he says, he sees typical 0.15 ms values on his PC with VMware Workstation. I wonder whether someone can share thoughts and experience about it (and other performance values). I found this interesting too: https://www.duo.uio.no/handle/10852/34900 I will take some time to play with various setups in the near future. Regards Peter