There have been significant performance upgrades so it will appear to run faster but not use more bandwidth.
Thanks for that, and the overall effect seems to be a faster conclusion, and that is probably good for most users. I appreciate that mine is an unusual situation, and my concern is for the apparent bunching of the bandwidth use. I hope that it will not lead to public providers closing Bitcoin ports, and forcing us to use web wallets. Several providers already close the ports in England - public libraries and Sainsburys supermarkets are just two of them.
I've upgradedd the Windows 10 machine. I'll upgrade the Ubuntu machine and see if I get the same results.