The spec for your laptop is gigabit. you either have a faulty network cable, a 10/100 cable, or the other end is attached to a 10/100 highest speed capable device. Try another cable, and make sure all 8 pins have cables going to them. If it's only 4, you have a 10/100 cable.
I have a router that tells me it supports wireless AC1750 which means the maximum link speed of 1300Mbps on the 5Ghz channel and 450Mbps on the 2.4Ghz channel. But, note that it is impossible to achieve this in real life. This kind of stat is standard marketing stuff in a lot of environments. Cars & their Miles Per Gallon is another where the numbers are excessive. Internet speeds from providers always say "Up to X MB" but that is for an extremely small number of customers.
Wifi is perfect for small files, but slower than ethernet for transferring a 4GB file due to bandwidth and Latency. Bandwidth is just as important, and the easiest way I can describe it is when you are hammering a nail into wood, bandwidth is the hammer, and Latency is the speed you are moving the hammer at. Wireless can only use small hammers and a certain speed. The opposite applies for ethernet.
Ethernet will always be better, regardless of whatever speed of wifi there is - You simply cannot beat physical wire between two devices.
If you have USB3, you can use a USB3 to Gigabit ethernet adapter. This may not reach gigabit speeds due to other limitations of USB3 Ethernet adapters, but will be better than wifi unless you are sitting close to the router and have little or no noise level.
Older interfaces that are good for ethernet adapters are PCMCIA & Cardbus, but again these interfaces are limited with ethernet adapters due to their age and speed.