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I’ve been using an old surfboard modem with google wifi mesh for years but never seeing speeds over 150mbps. Xfinity told me this was because my modem was outdated and couldn’t support higher speeds, which by the specs is probably true. so I upgraded the modem to the s33. With speed tests, I was now getting 800mbps at the modem (what I pay for), but my WiFi was still topping around 200mbps on devices nearby.
 

I decided to ditch the mesh altogether as my house is not that big, and got the g36 modem/router instead. Now on 5g, I’m getting WiFi speeds between 350-450 when near the router, down to 80mbps two rooms over. On 2.4g I’m getting 40mbps max. Is this really the best WiFi speeds I can get with the g36? 

G36 is compatible with the speed plan you are in and since you are facing slow speed issue  since this happening on Wi-Fi we would suggest you to try changing Wi-Fi channels 
will avoid interference and that will give better speed and connection.  If other Wi-Fi sources such as neighboring wireless access points are using the same wireless channel, this may cause slow speed and intermittent connectivity issues, even if the competing signal is relatively weak. Changing the wireless channel within the  gateway can improve speed and connectivity.

http://arris.force.com/consumers/articles/General_FAQs/G34-G36-Changing-the-Wi-Fi-Channel

After changing Wi-Fi channel as recommended on the link restart the modem then we would request you to monitor the connection for next 24hrs.

Also need to check the cable signal level to isolate the issue

http://arris.force.com/consumers/articles/General_FAQs/G34-G36-Cable-Signal-Levels