I have a LOT of devices connected to the wifi on a regular basis - multiple IP cameras, Amazon Echos, Chromecasts, a smart TV, smart irrigation controller, smart thermostat, Kindles, phones, etc

To the mesh unit nearest my smart TV, I used the ethernet option versus wifi

phones, tablets, and smart tv's in my home

Another thing I noticed was that there was no lag when I had one laptop, 2 iphones , an ipad and a andriod tablet being used in addition to streaming Netfilx on the smart tv

When watching movies and Television shows our TV would freeze and stutter all the time while re-buffering.

and I was able to connect my devices (tablet, laptop, Smart TV and phone) to WiFi without any problems