I am very impressed with how quickly a page/post full of YouTube videos (40+) loads with this plugin. Other then some minor YouTube player actions not functioning (such as the volume control not popping out when hovered over), you cannot tell that you are not looking at a full array of real YouTube players ready for action. And the videos are ready for action; they begin to play quickly when the play button is pressed.
The only drawback I found was that in a mobile view, the video player does not respond (as in responsive) the way it does when launched without this plugin activated, which means that in many cases, only half of the player is visible; whereas without the plugin the player is automatically reduced in size and the whole screen is visible.
If this lack of responsive behavior can be resolved, this plugin is a definite must have for those who post a lot of videos on a single page/posts.