It&#x27;s a flame graph or flame chart. I found this video explaining how to use them: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=g0g4ML4nhPg" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=g0g4ML4nhPg</a><p>I think the basic idea is: say you have some code like this.<p>function a() { &#x2F;&#x2F; 6 ms
  b(); &#x2F;&#x2F; 3 ms
  c(); &#x2F;&#x2F; 3 ms
}
Then you might have a flame chart that looks like this:<p>[-b-][-c]<p>[---a---]<p>Essentially you&#x27;re decomposing the time we spend in a() into its constituent pieces b() and c().