@Bfassler Using connection preference feature force Roku to use 5GHz band only. It is under "Preferred WiFi Band." Only very old Roku models do not support 5 GHz (WiFi5). See if it helps. I am not...

@Macca14 This is correct. Other options are M5, M9 Plus, S4 and S7. Any of them as Main Deco will unlock faster speeds.

@G_1Par Yes, it is possible. You will have to run Deco mesh in Access Point mode.

@Macca14 Suppose you have PC connected wirelessly to Deco E4, and file server also connected wirelessly to same E4. If you try to copy file from file server to PC, data transfer speed will be faster...

@Macca14 Check this link and scroll down to "Ethernet Ports" section: https://www.tp-link.com/en/home-networking/deco/deco-e4/#specifications It does not matter how fast wireless speed of Deco E4 is...

@Macca14 If you check hardware specs of Deco E4, you will see it has 100Mbps (Fast Ethernet) Ethernet ports, not gigabit. Main Deco E4 wired link is what limits Internet speeds.