Steam – How to turn on the Steam Link without a Steam Controller

From the image you posted your system is actually doing software encoding which is very cpu intensive and I suspect is your problem.

Since you have a 780ti install Geforce experience if you haven't already and turn on shadowplay and turn that to manual if you don't actually plan on using it. This should in theory force your graphics card to do the hardware encoding and should fix it.

You'll know it's working if you see instead of "2 threads" in the encoding printout you see NVFBC.

Steam Link is essentially streaming rendered gameplay and user input back and forth between multiple devices. This will require a reasonable amount of network bandwidth but more importantly, stable and low latency.

It's not likely that you'll experience bandwidth related issues as a result of using power line networking so we'll concentrate on latency.

The latency and quality of signal when using power line networking is entirely dependant on the environment - that is, the electrical wiring within your home. This varies wildly from building to building so even generic advice probably wouldn't apply.

Some people report latency increases of 20+ms as a result of using power line networking which is where the issues will start occurring. Adding an extra 20+ms of latency will result in noticeable input lag and an overall inferior gaming experience.

Your best bet is to get actual numbers and that's going to involve testing such technologies within your own environment. Due to the variances in the quality of electrical wiring, many people find it works fine and many people find WiFi to be more stable. Your mileage will vary based entirely on the electrical wiring within your own environment.