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Hi ***** assume the TP-Link device you have is what is known as a power line adaptor, where you plug a network cable at one end to the router, then a network cable in at the other end into your remote computer.
With this in mind you need to look at the speed of the power line adaptors, rather than the make.
They normally have the speed indicated on the label such as 200mbps, the current ones you can buy are 500+mbps such as the ones here for under £30.
I assume your using speedtest.net to check the speed between your house and the out building, which is showing a 50% loss?