Is it inflating the results shown on Wi-Fi? I am on a MacBook Air Early 2014 and my current link speed is 144 Mbit/s according to Network Utility, but fast.com

Is it inflating the results shown on Wi-Fi? I am on a MacBook Air Early 2014 and my current link speed is 144 Mbit/s according to Network Utility, but fast.com shows between 210 to 230 Mbps on each run. Speedtest.net results are consistent as before at ~38 Mpbs, which is what I would expect from the routers around me.