WebPagetest Forums
Accessing Web Vital TBT on a Private Instance - Printable Version

+- WebPagetest Forums (https://www.webpagetest.org/forums)
+-- Forum: WebPagetest (/forumdisplay.php?fid=7)
+--- Forum: Private Instances (/forumdisplay.php?fid=12)
+--- Thread: Accessing Web Vital TBT on a Private Instance (/showthread.php?tid=16176)



Accessing Web Vital TBT on a Private Instance - dimension85 - 08-20-2020 05:02 AM

I have recently set up a private instance and have it working well and have found CLS and LCP in the JSON output.
However, what is necessary to get TBT available as well.
I can see it on UI-based requests but seem unable to surface the metrics through the API (for the same URL).
Any insight on this would be appreciated.
Phil


RE: Accessing Web Vital TBT on a Private Instance - pmeenan - 08-21-2020 01:21 AM

Pass timeline=1 as a test option. Timeline capture is necessary to capture the main-thread activity. It is enabled by default in the UI usually but needs to be requested through the API.


RE: Accessing Web Vital TBT on a Private Instance - dimension85 - 08-21-2020 05:32 PM

Thanks Pat, applied this and it works fine now.