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5GHz wireless slow internet speeds

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5GHz wireless slow internet speeds

To start off, this is the adapter I am using:

Link to adapter

When I run a speed test on fast.com from my phone, it shows 150+ mbps however the best I can do on the desktop is barely double digits, around 15-20. This has been going on for quite some time but after a few calls to Comcast with no help, I resigned myself to living with it, but now I want to see if anything can be done. Any help or suggestions are extraordinarily appreciated. 

 

 system.JPG