Yes, You can disable the ISP WiFi, connect your Primary Deco node to the ISP's Router and connect everything to the Deco WiFi.

@EdOandS4 It is the difference between the PC WiFi NIC and your Cell phone which has a very efficient WiFi NIC.

@DKS736 Yes you can. As long as the source outlets and the destination outlets are on the same side of your electrical circuit panel. In fact you can add two PowerLine Decos to your existing Mesh. Or...

Have you used the "Speed Test" option inside the Deco App? I have found that to be the best determination of your true ISP speed. I have customers that have varying speed plans and all test usually...

You didn't say which node were satellite and which was the primary node. Just a thought, this may or may not work, if you are using a V2 as the primary node or vise versa, have you tried swapping the...

@Zek7717 Test your speed from a current generation Tablet or Cell Phone. Desktop wired ethernet connected devices are very hobbled by their onboard Ethernet NICs. 256MBps on a desktop is very fast....