hi,

i have 3 units of deco M4 placed in each corner of the house. i am not a tech knowledge guy with these stuff so my terminology might be wrong, appologies in adavance.

so i have a fiber connection and the fiber line is coonected to a modem provided by the ISP. the main deco M4 node is connected to the modem via ethernet cable that came with the deco box. 

From the maindeco unit i have a cat 6 cable that goes to a 100 MBPS spliter. from the spiliter i have 2  cat 6 cabe connecting the other 2 decos.

when i use my phone to do a speed test the main deco gives me 150 MBPS whilst the other 2 only give me around 25 MBPS.

Please can some one help me with how to get the same speed everywhere.