@Kossie Connect laptop to second Ethernet port of Main Deco and run same speed test on it. You should be getting close to gigabit speeds, same as when laptop is connected to modem.

@EvilDoctorK Yes, that gets confusing. Bring back Zyxel switch to its original place, unplug everything from it but the link to TL-SG1008D. Also, unplug every device from patch panel connected to...

@Kossie I used to have Deco M9 Plus. I have gigabit Internet. On desktop PC wired to second Ethernet port of Main Deco I had 950Mbps. On smartphone wirelessly connected to Main Deco I have seen...

@Marcos_K You can connect Deco X1500 through TP-Link powerline adapters (their Ethernet port). I suggest to check wired speed over powerline link: if you are getting less than 200Mbps over powerline...

@Bandyrobs You need wired link to make it work, if powerline is not stable and coax/Ethernet is not an option, you may be out of luck. You can mix X50s and M4s, but that will not improve anything....

@EvilDoctorK Another test: bring both the 'Garden' node and TL-SG1008D into the house, connect TL-SG1008D to Zyxel switch, connect "Garden' node to TL-SG1008D. If Ethernet backhaul is stable, the...