title: Angular material CDK tree component with virtual scroll
body: <p>Angular Material CDK tree component documentation says:</p>
  
  <p><em>"Flat trees are generally easier to style and inspect. They are also more friendly to scrolling variations, such as infinite or <strong>virtual scrolling</strong>"</em></p>
  
  <p>Any ideas how to apply virtual scrolling to CDK flat tree?</p>
  
  <p>I have a massive tree to render and right now it is so slow and when I open all nodes recursively it will crash</p>
  
  <p>I tried &lt; cdk-virtual-scroll-viewport > @angular/cdk-experimental but did not figure it out how to integrate it with tree component</p>