WebPagetest Forums
Identify blocking or gap causing request - 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: Identify blocking or gap causing request (/showthread.php?tid=15535)

Identify blocking or gap causing request - atisdale - 10-25-2018 02:59 AM

I'm running tests against a site with a lot of third party requests.
I see that often the doc ready is very slow (65 secs)
I'm trying to identify which request is causing this slowness, but I don't see any blocking requests higher up in the waterfall.

I have read the blocking might be caused by javascript execution. How do I identify which request is running javascript causing the blockage?

I've add a partial screen shot of the waterfall view, I can add the rest if it is useful.


RE: Identify blocking or gap causing request - andydavies - 10-25-2018 08:39 PM

Performance tab of Chrome developer tools is what I'd use to debug this further but from this waterfall https://www.webpagetest.org/result/181025_66_58323e6784d158c192c30f6a5795aa0c/1/details/#waterfall_view_step1 it looks like

1. https://b-code.liadm.com/a-01db.min.js looks like a candidate for an initial investigation - notice how it's JS execution extends to onload

2. I'd be tempted to take a close look at Optimizely too and maybe consider moving it so it loads sooner