Youtube casting was buggy when it debuted in the updated YouTube app a few months ago. Now it has been perfected. Casting is instant and so is fast forwarding or skipping. To my surprise on the Apple TV it's a lot faster than Airplay. Neither do the video stop if I close the YouTube app on my phone or watch a video in the browser. What's great is that if you download Google home on your iPhone or iPad, you can cast to the Apple TV and enjoy the benefits casting has over airplay. All that's missing is 4K YouTube and I'll unlikely ever have to buy a Chromecast for my living room TV.