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From the Steam Link settings menu, choose In-Home Streaming. Then Advanced Client Options and turn on Display performance information. That should give you the FPS of the stream, and pressing Start+Y on the controller (triangle if PS3/4) will show more detailed info.
I typically get 1ms input (from link to PC) and 10-20ms back the other way. Stream tends to be ~30Mb. Works really well in all but the fastest games.
Hare the Steam Controller tho, that haptic pad is a shit alternative to a second stick.
Hmm, could well be. Not sure how you'd test the end FPS then.
I've not seen any noticeable speed changes. I am on a wired network with a decent router though.