There is no such thing as wifi faster than wired lan.
So here is the thing.
Use a similar browser, without tabs or any plugins or extensions.....on both the wifi and wired lan.
You will see that your wifi is slower than the wired lan, as this is a given.
The reason your speedtest is giving you a slower reading has to do with your browser on the wired lan. Too many open tabs and other nonsense.
Problem solved.