YouTube is taking on Twitch with its latest feature—60 frames-per-second HD livestream support. The streaming video site now supports livestreams at 60fps for 720p and 1080p resolutions. It makes use of YouTubes HTML5 player, which lets viewers see previously recorded portions of the streams in 1.5x or 2x speed if they want to. YouTube will knock down the frame rate to 30fps if your device can’t support 60fps.
These kinds of videos are already up on YouTube but you can’t really tell if the stream your watching is using this frame rate. PCWorld suggests games like Counter-Strike: Global Offensive; if you want to see videos in all their 60fps silky smooth glory, that is.
Source: PCWorld