Low Download Speeds over Wi Fi from M1 Mac Mini running Big Sur
I have upgraded a 2014 Mac Mini to a 2020 M1 Mac Mini running mac OS Big Sur. The M1 Mac Mini has about 1/10 th the download speed as the 2014 Mac Mini and my wife's about 2 year old iMac. All of our iOS devices also have high download speeds.
I am measuring speed using Speedtest by Ookla at www.speedtest.net . This gives ping, download, and upload speeds. My wife measures: ping 15 ms, download 50 Mbps, and upload 5Mbps. When I ran from the M1 last night, I got 15 ms, 5 Mbps download, and 5 Mbps upload. This afternoon, the first run was 12 Mbps download, then the next three runs were around 8 Mbps download. The ping and upload speeds are normal.
It doesn't seem to be the bluetooth/wi fi interference I read about. My keyboard is connected by blue tooth and USB. I have turned bluetooth on and off with no effect on internet download speed.
Ethernet isn't practical here. We have long since switched to wi fi and removed about 150 feet of ethernet cables from all over the house. Besides, that doesn't explain why other Macs have full download speed using wi fi, but the M1 mac mini doesn't. The 2014 mac mini is stacked below the new M1 mac mini, so it isn't location.
Our wi fi network uses older model Airport Extreme base stations, FWIW.
Mac mini 2018 or later