Highly variable download speeds between devices

[switters1974]

I have Xfinity Gigabit service. I just did a speed test with my MacBook Pro about 10 ft. from the router. I got only ~85 Mbps. I then did a speed test with my iPhone 11, and got 400 Mbps, which is more in line with what I'd expect. 

I checked the xFi app and both devices are connected to the Gateway. 

I repeated this test a few times, and while the numbers differed slightly, the MacBook Pro was consistently quite a lot lower in download speed than my iPhone. Shouldn't it be the opposite? 

[ekkoville]

Do you have an Xfinity gateway? I have Gbps service also and recently got the Xfinity gateway with pods. My speeds were all over the place, as low as 33 Mbps a lot. Tech came out and there was no boot file or something when I moved to the Xfinity gateway. New gateway and provisioned it, now my speeds are around 300 Mbps most of the time.

[switters1974]

Yes, I have an Xfinity gateway (the XB6). An Xfinity tech has been out twice to check everything, and they say it's all fine on their end. 

[RobertWy]

https://forums.xfinity.com/t5/Your-Home-Network/Troubleshooting-Gigabit-internet-speeds/m-p/3145413#...

https://forums.xfinity.com/t5/Your-Home-Network/Video-10-things-you-can-do-right-now-to-fix-your-int...

[EG]

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@switters1974 wrote:

I have Xfinity Gigabit service. I just did a speed test with my MacBook Pro about 10 ft. from the router. I got only ~85 Mbps. I then did a speed test with my iPhone 11, and got 400 Mbps, which is more in line with what I'd expect. 

I checked the xFi app and both devices are connected to the Gateway. 

I repeated this test a few times, and while the numbers differed slightly, the MacBook Pro was consistently quite a lot lower in download speed than my iPhone. Shouldn't it be the opposite? 

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For a test, what do you get on the Macbook Pro when it is hardwired directly to the XB6 device with an ethernet cable ?