Question Eternet speed drastically slowdown after changing router

[Smartestdumbo]

So I have recently changed my router ( its spec is definitely better than my old one ), however, my downloading speed drastically decreases from 12mbps+ to 400kbps and I don't why ...
someone please help
Router: ASUS RT-AC68U

 

[kanewolf]

So I have recently changed my router ( its spec is definitely better than my old one ), however, my downloading speed drastically decreases from 12mbps+ to 400kbps and I don't why ...
someone please help
Router: ASUS RT-AC68U

Is this a wired or wireless connection to the router?
If wireless, are you using 2.4Ghz or 5Ghz?

 

[Smartestdumbo]

Is this a wired or wireless connection to the router?
If wireless, are you using 2.4Ghz or 5Ghz?

it is connected with lan cable