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Steam Remote Play lets you do the same thing too. Lag can still be an issue though, especially over WiFi, but it's highly dependent on the game and your network conditions. I've used it with some decent success over wired home networks though, even for relatively latency sensitive games. And I agree, I trust native encoding/decoding like this far more than external dongles when it comes to latency - as long as the hardware is up for it, that is. But it's much more of an "either it works or it doesn't" situation rather than the iffy in-between laggy/artefacting of low quality capture devices. For example, I've used my laptop as an external display for my travel gaming PC with both an Elgato HD60S and a Genki Shadowcast, and both work very well if it's connected to power - but if it isn't, things get really laggy. I would assume the video signal from those devices is decoded using QuickSync (and CPU loads are low during use, so that seems correct), but things still get unusably laggy unless the laptop is on its charger.