Deco M5 slow WiFi speeds
Hi, I recently bought a Deco M5 for my bedroom (just one) because I live in an multi-floor appartement with terrible speeds WiFi-speeds upstairs. The modem is one floor lower than my bedroom. I know one deco isn't ideal but it's what I have now and in terms of good connection it works just fine. I plan on buying a second deco for downstairs in the future, so my modem Wi_fi won't have to be used anymore.
I plugged the Deco into the ethernet outlet in the wall (which is connected to the modem downstairs) and the app gives me speed readings of 850Mbps down and 50Mbps up. This is fine for me since my internet subscription with my provider is 1000Mbps down and 50Mbps up and the Deco isn't listed for speeds higher than 850Mbps on the 5Ghz channel anyway.
When I Speedtest my devices right next to my Deco however they're only giving me results of 365Mbps down and 50Mbps up. This is more than a 50% loss and seems not normal to me? I use new devices like an iPhone 13 Pro and a MacBook Pro M1. These should have no trouble handling higher speeds, right?
QoS should be disabled so this shouldn't be the issue either. Any ideas?