So I was excited to receive my new Deco M4R mesh wifi system.  I immediately installed the new wifi system without issue.  After installation I started testing speeds.  OMG, like many others out in the world my internet wired speed was cut in half.  I pay for 200mbps and I was only getting 100mbps.  Boy did my heart sink.  I tried various things that others tried on the forums.  Long story short, the ethernet cable that came with the system was bad.  Once I replaced that cable with another that I had, BOOM the rocket took off.  I'm a happy camper now.  NOTE:  Once you change out the cable, reboot modem and computer.

Jr from Atlanta, GA