I just read this article http://www.legitreviews.com/disabling-nvidia-streamer-service-gives-video-card-performance-boost_162524 which reports a possible 3-5 % performance increase by disabling the service set up to stream games to Nvidia's Shield tablet.
I noticed there is an option to disable streaming in GeForce Experience but it doesn't seem to affect the service, so I went ahead and disabled it via task manager as suggested in the article. I haven't done any benchmarking to see if it's made any difference but I can at least report that everything else seems to still be working fine..

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