WebPagetest Forums
Understanding process breakdown - Printable Version

+- WebPagetest Forums (https://www.webpagetest.org/forums)
+-- Forum: Web Performance (/forumdisplay.php?fid=3)
+--- Forum: Discuss Test Results (/forumdisplay.php?fid=4)
+--- Thread: Understanding process breakdown (/showthread.php?tid=12788)



Understanding process breakdown - teched - 01-31-2014 03:23 AM

Dear community,

I need your help to have a better understaing of what process breakdown categories means.

I would like to have a link to documentation or at least a summary of these categories:
  • Scripting
  • Rendering
  • Loading
  • Painting

And these events:
  • Program
  • Function Call
  • Layout
  • Evaluate Script
  • Recalculate Styles
  • CompositeLayers
  • ResourceReceiversData
  • Paint
  • GCEvent
  • Timefire
  • PaintSetup
  • EventDispatch

Thank you all in advance for answering.

TechED


RE: Understanding process breakdown - pmeenan - 02-07-2014 12:46 AM

Those are just a breakdown of the Chrome Timeline. The dev tools docs are probably your best resource for that: https://developers.google.com/chrome-developer-tools/docs/timeline


RE: Understanding process breakdown - LordTaco - 08-29-2018 09:42 PM

Hi Webpagetest Team, I have found some differences between the results shown in the timeline view and the ones given directly on the Chrome Dev Tools. I understand the Breakdown timeline may not show all the detail information, but 1. why is the "Composite Layout" task not appearing like the scripting, rendering and paint tasks? Furthermore, 2. I have noticed that above a "click" event task there is always a "Animation Frame Fired" task. When i record the same event directly on Chrome dev tools this task does not appear(at least not over the "click" event task).

Here the timeline example:
http://www.webpagetest.org/chrome/inspector-20170320/inspector.html?experiments=true&loadTimelineFromURL=/getTimeline.php?timeline=t:180827_N9_720154e7d7d6a8cf334d65ea92404075,r:1,c:0,s:​2
Here the full test:
http://www.webpagetest.org/result/180827_N9_720154e7d7d6a8cf334d65ea92404075/

Thanks a lot!! Smile