lighthouse · Issues· 464 open

PageSpeed Insights / Lighthouse synthetic performance results may not always measure the same page lifecycle experienced by a normal first-time user.

PageSpeed Insights intermittently includes unrelated bzr.openai.com requests in network dependency tree

Observed FCP/LCP inflated by whole seconds in headless runs (viz ThrottleUnresponsiveClient BeginFrame throttling) - reproduces on PSI

Move charset audit from Best Practice to Performance insight

Report perf metrics on soft navigations

PSI/Lightrider: observedFirstPaint 1.1–2.2 s after the frame is on the filmstrip; reproducible on Shopify storefronts

NO_LCP in PageSpeed Insights with Lighthouse 13.4.1 despite fully rendered page

PSI intermittently attributes unrelated URL request to first-party script in Network Dependency Tree

Agentic Browsing false negative: PSI reports missing H1 and links in llms.txt although both are present

Disable

PSI sometimes stalls for a full second to show content, even without app JS or web fonts

PageSpeed Insights network dependency tree shows unrelated Vimeo and LEGO-associated requests

Utilize node creation stack traces in report

نوزاد.

PageSpeed Insights seemingly cannot download MP4s - negatively affecting score