Unexpected changes in main thread time reported around March 8th #15896
Description
Summary
Hey all, I have been investigating the numbers reported by Pagespeed Insights API (therefore Lighthouse) for my company's SDK. We can see a massive spike in the metric from a third-party website that lets us understand changes over time to metrics such as main thread time.
Based on the below, has a change been released to PageSpeed Insights that could explain these differences? I believe the v11.6.0 would have been deployed around that date, so could this contribute to these changes in reporting?
I appreciate Econify is a third-party platform, but we have confirmed that they use PageSpeed Insights API under the hood.
Interestingly enough, the main thread time varies substantially between a few other providers too, where some improve drastically and others appear to worsen.
More vendors:
- https://www.econify.com/performance/vendor/appnexus
- https://www.econify.com/performance/vendor/the-trade-desk
- https://www.econify.com/performance/vendor/sharethrough
- https://www.econify.com/performance/vendor/smart-adserver
- https://www.econify.com/performance/vendor/openx
- https://www.econify.com/performance/vendor/speedcurve-rum
- https://www.econify.com/performance/vendor/triplelift