Damn strange.
The computer is in a static location for all tests. This is still using
iperf in all cases, but abbreviated since I'm copying by hand. Each test is
about five seconds apart.
Fedora 25 live
58 Mbit/sec
61
41
Fedora 24 live
54 Mbit/sec
46
38
65
Fedora 25 installed
29
42
38
38
There are a total of three wireless devices connected to this AP. All are
connected at the same time but only the test client is actively being used
when the testing is happening. But it's in an apartment building, with
hundreds of units all of which have wireless APs.