AX6000 built-in speed test not accurate
I've got the TP-Link Archer AX6000 Wi-Fi 6 router, with the latest firmware.
It has a built-in speed test, which lets you test the speed connected directly to a cable modem. I'm paying for 1.2-Gbps service from Comcast, using a DOCSIS 3.1 Netgear CM-1000 modem. The best I've ever seen in the built-in speed test is around 800 Mbps down, typically speeds are in the 600-700 Mbps range.
I decided to have Comcast check my service and arranged a tech visit. Before he arrived, I decided to do a speed test with an M1 MacBook Pro connected directly to the cable modem with a Gigabit Ethernet adapter. I saw speeds of around 915 Mbps down. Had I been paying for only 1 Gbps service, I probably would have canceled the apppointment, but I'm still far from what I should be getting.
That said, it's clear that the built-in test in the TP-Link router is inaccurate. Has anyone else seen this issue, and found a fix?