Remote Play functionality was similarly impressive. There was zero perceptible lag between PlayStation 4 on-screen action and what we were inputting on the Vita. The same sentiment applies to input directly on the Vita for the PS4 game we were playing: no lag, as if Knack were a game being played locally on the Vita. How this will play out with your own home WiFi is another question altogether, which we'll test more thoroughly when we get PlayStation 4 review units in the coming weeks. As of right now, it more than stands up to NVIDIA's Shield. If anything, it bests the Shield's streaming performance with zero hitches while we played.
This is one of the more exciting launch capabilities of the PS4 for me, knowing that hands on performance is this good makes me pretty happy.