Hello, just asking for an advice

i have a Deco S4 and all connected via Ethernet backhaul.

I'm also with LiLaConnect with 1GB Download/Upload

This is my setup -> I get maximum of 250Mbps

which is a star network

Modem -> Main Deco -> Switch

From switch i got the other 2 Decos connected via Ethernet.

What I've tried is

Modem -> Main Deco -> Second Deco -> Third Deco

All via Ethernet and I get around 600Mbps minimum

My switch is - TP-Link TL-SG105S

Can anyone help me with this please

Thanks, Much Appreciated 

Jerick