@centurion76 

Hello, what is the bandwidth you paid for your ISP? 

The actual wireless speed is affected by many factors, including the bandwidth, the main router, distance, wireless negotiation speed. 

With your device connected to the 2.4GHz of Archer C2, please click here to get the wired negotiation speed of it. 

Note: The steps are the same, you need click on ethernet connection. 

Besides, for your information, the wireless speed is about 60% of the wireless negotiation speed; combined with the interference, it may be lower. 

May it help.