They have lowered the weighting on First Contentful Paint (15%) and Speed Index (15%) which totalled 30% of the score. However, with Lighthouse v6 the weighting has changed. Previous Google Lighthouse v5 weighting and metricsĬurrent Google Lighthouse v6 weighting and metricsĪs you can see previously Time To Interactive was weighted at 33% of the total score in Lighthouse v5 so even if you had a lot of Javascript slowing Time To Interactive, if you had a good First Contentful Paint (20%) and Speed Index (27%) which totalled 47% of the score, you could still get a relatively high Lighthouse score. Google Lighthouse v6’s scoring metrics have changed what they test and their weightings with the removal of First CPU Idle and First Meaningful Paint and addition of Total Blocking Time, Largest Contentful Paint and Cumulative Layout Shift and also changes to the score weighting to further emphasize the impact of excessive Javascript. It's the reason why Google PageSpeed Insights measures and presents both lab and field metrics for you to see. You can use the lab metric data as a relative guide in tracking your improvements and changes in conjunction with real world field metrics. This also means if you're optimizing your pages and page speed, you'd need to wait at least 28 days to see the full picture for real world field measurements. If there isn't enough real world field data for the page tests, Google Page Speed Insights will report the origin real world field data.Įxample for this forums when not enough real world field data, it will report the Origin Summary data collected over the last 28 days and assess whether you pass the Core Web Vital assessment which is derived from the same data in your Google Webmaster Tool's Core Web Vital metrics tracking. So do not read too much into the single score reported for lab data. Note for purpose of Google user page experience signals, Google is looking at real world Core Web Vital metrics in the form of field data and not the synthetic lab data which Google Page Speed Insight's single score is based on. The less javascript you have on a page, the better the user page experience. The gist of Google's user page experience signal measurements is that if you have a lot of javascript loading on your page, it will impact a users page loading experience and thus you'd lower your scores. You can read the updated HTTP Archive Web Almanac 2020's Google Lighthouse Performance section for more details. ![]() ![]() Your decisions on what theme, layout and number of 3rd party requests/ads you place on your sites' pages and the order of loading those assets will impact the page speed metrics measured. Google PageSpeed Insights uses Google Lighthouse v6 API to test Google's page experience signal new Core Web Vitals metrics for both test lab and real world field data test (via Chome User Experience Report - CRuX) of your site’s theme/layout as well and how it’s put together.
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