title: Deferred long-running timer task(s) to improve scrolling smoothness
body: <p>I was inspecting my page and I got this warning:</p>
  
  <blockquote>
    <p>Deferred long-running timer task(s) to improve scrolling smoothness. See crbug.com/574343</p>
  </blockquote>
  
  <p>I've also seen:</p>
  
  <blockquote>
    <p>Blink deferred a task in order to make scrolling smoother. Your timer tasks should take less than 50ms to run to avoid this. Please see <a href="https://developers.google.com/web/tools/chrome-devtools/profile/evaluate-performance/rail">https://developers.google.com/web/tools/chrome-devtools/profile/evaluate-performance/rail</a> and <a href="https://crbug.com/574343#c40">https://crbug.com/574343#c40</a> for more information.</p>
  </blockquote>
  
  <p>What is this?</p>
  
  <p><a href="https://i.stack.imgur.com/kIaxQ.png"><img src="https://i.stack.imgur.com/kIaxQ.png" alt="enter image description here"></a></p>