1 I am noticing significant 5G download speed degradation with an External APC Battery backup Unit.
With Battery backup download= <60mbps, without >=250mbps. Some noise sensitivity is causing this Issue. I cannot tell if it is the Wifi or the 5G having interferance issue. I am using it with Backup power disconnected.
2 In a congested Wifi, 2.4Ghz will never achieve >50Mbps, 5GHZ, if close enough works much better