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Core Web Vitals – How do you check if implemented fixes improved your scores?
Posted by on April 16, 2021 at 10:56 am* As we know Google assessments will be propably based on CRUX data
* This makes synthetic tools not the best way to check it
* CRUX data is updated once in monthSo, how do you check effects of implemented fixes?
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2 Replies
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You ought to wait for a month.
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What u/sannidhis said is true, you’ll have to wait for 28 days to get field data, but you can use lab data improvement % as a proxy to what field data improvement will be.
If you use PageSpeeds Insights or any other Lighthouse based tool, mobile test throttling will probably make the score worse than most of your users would get in field tests. From Lighthouse docs:
>This is the standard recommendation for mobile throttling:
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>Latency: 150ms
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>Throughput: 1.6Mbps down / 750 Kbps up.
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>Packet loss: none.
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>These exact figures are defined in the Lighthouse configuration and used as Lighthouse’s throttling default. They represent roughly the bottom 25% of 4G connections and top 25% of 3G connections (in Lighthouse this configuration is currently called “Slow 4G” but used to be labeled as “Fast 3G”). This preset is identical to the WebPageTest’s “Mobile 3G – Fast” and, due to a lower latency, slightly faster for some pages than the WebPageTest “4G” preset.
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