Hello, I'm using Stretch for a long time now on an amd64-PC together with a 3G-Internet-Modem-Stick. The behaviour how Stretch handles the band width and does load balancing between different applications is simply disastrous! For example: if I download large updates per "apt" it is not possible to open-up/load any site in "firefox"; just at the moment, when "apt" switches from one download to the other, than the page in "firefox" begins to load (as slow as if I had an ancient 56k dial-up-modem...). Also Stretch does not tap the full potential of the 3G-Modem's speed I guess - and this is not a provider-thing!
With the same PC and another Linux-distribution all this does not happen, so this is obviously Stretch-related! By the way: it also worked fine in Jessie... - so maybe it's a Debian-related "systemd-thing"? Due to the fact that Stretch comes out as "stable-version" within the next days (after almost doubled developing-time of two years), isn't that something to think about...? Regards Jack