So, I got a couple TP-Link devices a few months ago to try to extend internet to my garage (very old construction, separate building on the property) as wifi wa

So, I got a couple TP-Link devices a few months ago to try to extend internet to my garage (very old construction, separate building on the property) as wifi was having a tough time reaching there and I didn't want to mess with replacing the whole rest of the network and running some sort of mesh setup. I currently am using a cheap docsis 3 modem (I believe it's a netgear), and an apple airport extreme for the main network, which is extended to the garage through a couple TP Link powerline networking adapters. I haven't benchmarked the specific powerline performance, but I do know that if I hit up fast.com on my house wifi from my laptop, I get about 100-120 Mbps depending on the day and network conditions. (there's a lot of weird stuff with diff devices and diff routers that I'm eliding here but the Airport Extreme performs very well in my house compared to everything else I've tried) in the garage, on ethernet to the TP Link powerline adapters, i get about 20 Mbps most of the time. It is pretty reliable, but it's a huge performance hit. Granted, I am using them in an extremely adverse arrangement: old wiring, running through lots of intervening hardware, through the ground, to my garage. I'm actually happy with them, for my purposes, but they're really not fast.