Why do I pay for 100Mbps and get 80Mbps?

Tested without router in circuit and got 100Mbps. Will buy a newer router and see if it fixes the speed issue.

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@pleasenoname wrote:

Nothing else is connected to the network right now and speed test reads at 80Mbps, instead of the 100Mbps I pay for.  There is no wi-fi used. Only Ethernet cables.

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I think if you read the description, you might find it says 'UP TO' 100 Mbps, nothing about 'guaranteed'.

Thank you for representing the comcast lawyer's opinion. However I am actually for solving this problem. Pehaps this is similar to the BTU rating on portable air conditioners. They were so inefficient that a new equivalency BTU rating was established to more accurately represent the comparable normal wall mounted/central  air conditioner BTU rating. 

Disregard. I did not see this post of yours, sorry;

https://forums.xfinity.com/t5/Your-Home-Network/Why-do-I-pay-for-100Mbps-and-get-80Mbps/m-p/3361592/highlight/true#M330997

Asking Intel.

 10/100/1000 (gigabit)  is listed for it's ethernet network adapter.

My question ?

https://ark.intel.com/content/www/us/en/ark/products/195506/intel-nuc-10-performance-kit-nuc10i3fnh.html

Newer router didn't fix speed issue.