I had the same problem. Netgear Router connected to T-Mobile router. Everything that connected directly to the TMobile router was blazing fast (@450mbs) but anything that connected to the netgear router was @130mbs. After going through various tests it turns out that the Netgear has a QOS (Quality of Service) setting that wass the problem. The QoS setting favors interactive traffic … but the speedtest app is a bulk transfer type of trafic and was getting throttled. Turned QoS off and desktop/Wifi/phone now all get comparable speeds.
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