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Enable hero element timing by default #1261
SpeedCurve have been capturing hero element timing with wptagent for a while now. I recently performed some analysis to figure out whether the times reported by wptagent were close enough to the times reported by our existing implementation. For around 95% of our tests, the times varied by <10%. I dug into a load of the remaining 5% of tests and we determined that most of the differences were for acceptable reasons - mostly caused by fuzziness, since our implementation works with JPEG frames.
Anyways, we're pretty confident that the implementation in wptagent is good enough that everyone can use it reliably, so I'd like to turn it on by default in webpagetest.org.
There will be an accompanying PR in wptagent.