@Andrewdj Please give me ISP modem brand and model number. That will help me to figure what you have. Connecting switch to ISP modem and all Deco to switch will substantially offload Main Deco, but...

@Andrewdj Based on Deco map, you have M5 and also some other Deco model: is it M4? Also, do you have ISP router in front of Main Deco or just modem?

@tphoney You can login directly to Satellite Deco study_room and do upgrade for that Deco only. Use study_room Satellite Deco IP address to login to it, same way you login to Main Deco, same...

@GuilhermeSantos In Access Point mode Deco will keep Main Network and Guest Network. You can rollback to default Router mode after you run speed tests. The reason I ask you to switch Deco mesh to...

@Chrisg2003 There is one special case, but I'll need you to run test to check it. If you power off Lounge Deco unit that uses WiFi backhaul, will another Satellite Deco switch from Ethernet to WiFi...

@GuilhermeSantos You said you have provider's Router. In that case, you can configure Deco mesh to run in Access Point mode and see if speeds improved. See Switching a Deco to Access Point (AP) Mode