How do I check my WAN speed? Is it the ISP internet speed? On the router box it says it can do up to 3000Mbps.
As mentioned above what matters most is how large a package you purchase from your ISP. If you for example buy only 100mbps package it will not go faster no matter what fancy router you buy.
The 3000 number is pretty much the standard router marketing guys lies, the engineering guys write the fine print. First what they did was add the 2.4g radio of 573.5 and 5g radio of 2402 to get "3000".
Marketing guys I think all fail math classes. Even if you add correctly the number is invalid because a end device can only use 1 radio at a time.
Next when you take each number individually they are adding the transmit and receive speed together. They would call a gigabit ethernet cable 2gbit but ethernet can actually transmit and receive exactly at the same time where wifi is half duplex and only do one.
Next these are not speeds they represent data encoding To get 2402 you must run 160mhz channels, 2x2 mimo and QAM1024 data pattern. As mentioned in previous posts 160mhz channels is very hard to get on wifi6 both because of weather radar and because of other people in other houses attempting to use the same bandwidth.
Next QAM1024 really only works well close to the router, most time in the same room where you could just use a ethernet cable. So if you drop back to 80mhz data channels and QAM 256 you pretty much have a wifi5 (802.11ac) router that has a on the box lie number of 1200.
Knowing all these details is key to making good purchasing decisions and if you were to really mess with tuning settings like guard intervals you would actually have been able to explain what I did above yourself since changing the guard interval is a even more advanced topic.