Read 2 blogs today, want to reference them here, one is the “Rendering Performance” and the other is “CSS Houdini”.
“Rendering Performance”
https://developers.google.com/web/fundamentals/performance/rendering/
“CSS Houdini”
https://developers.google.com/web/updates/2016/05/houdini
And 2 web page render diagrams are also attached.