@Philbert Note he specified "Model: Deco E4," which has 100Mbps Ethernet ports. As long as his Main Deco is E4, 90Mbps is all he can get for Internet connection made through Deco.

@Jka21 Download and Upload numbers that you see in Deco app are not speed test results. They show current WiFi network utilization. They are often low, and they are not real time. Unless you happen...

@Abdullabh Have you scrolled down to Frequently Asked Questions section of that article, and specifically Q4, Q5 and Q7?

@Abdullabh The following FAQ article by TP-Link may help: General questions about Ethernet Backhaul feature on your Deco

@MannIsm The way you draw the picture, it should definitely work. If you have multiple wired devices connected to the switch and they all experience loss of connection simultaneously, the suspect...

@Colin_R I am assuming you run Deco in its default router mode, and there is no other router in your home network between Main Deco and Internet. RDC (Remote Desktop Client) uses RDP (Remote Desktop...