I didn't find my model in the drop down list, but it's the Deco W6000 v1.2 (2 pack), Firmware 1.0.2 Build 20210421 Rel. 65964.
I have 800Mbps internet service and currently 15 connected devices, all of them wireless except for my desktop PC with Gigabit LAN wired directly to the Main Deco unit, using a 5ft Cat8 ethernet cable.
My Samsung Galaxy S10e is the only WiFi6 device I have right now and when I speed test with it, it can easily reach my maximum download speeds (810-840Mbps).
I've always found ethernet to be faster and more stable than wireless, so I like to have my PC wired because I use it for gaming and downloading/uploading large files. It has an AMD Ryzen 5 2600X, 16GB RAM, 1TB M.2 SSD, Radeon RX 580, and gigabit LAN, so there shouldn't be any hardware related bottlenecks. However in this case, I can't seem to max out my download speeds using the Deco's gigabit ethernet ports. My PC averages around 640-680 Mbps using the same speed test.
Is this normal, or by design?
I updated the network card driver, tried different advanced settings in Windows device manager, and also used Speedguide Optimizer tool, but no real change.
Regarding the Deco App, there seems to be a bug when I open HomeShield and run the Scan. It always shows that I have 1 risk under Network Security, that there is a new Firmware available, but when I click to to Update, it just says I'm up to date.