Not sure what you are running that claims 54mbps...that is a rather old device. Most newer ones claim 300 or 900 or whatever magic marketing number they like.
Most times you see rates on wifi are related to the way the data is encoded. It is some theoretical number that you can not actually use. It neglects important facts like data is both transmitted and received. There are many other things that slow this down. The so called 300mbps devices only get in the 50mpbs range in most houses. Even the very fastest 802.11ac devices using 4 antenna/feeds only get in the 200mbps range.
Of course if you do what the manufacture do and connect the pc via a cable to the antenna ports and then modify the protocols to only send you can get massively higher numbers.....but it is much easier to use ethernet cables in that case and you could get 1gbit up and 1gbit down for total of 2gbit and it works with no special software.