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Observe soft-navigation paint entries so NgOptimizedImage can diagnose route-level LCP images in SPAs. Correlate interaction IDs to avoid treating ordinary interactions as navigations. The adds `PerformanceSoftNavigation` and `InteractionContentfulPaint` performance entries so SPAs can measure interaction-driven same-document navigations and their contentful paints. Chrome plans to enable this API by default in Chrome 151. References * https://developer.chrome.com/docs/web-platform/soft-navigations * https://developer.chrome.com/blog/chrome-151-beta * https://chromium.googlesource.com/chromium/src/+/refs/heads/main/docs/speed/metrics_changelog/soft_navigations.md
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September 28, 2026 19:31
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Observe soft-navigation paint entries so
NgOptimizedImagecan diagnose route-level LCP images in SPAs. Correlate interaction IDs to avoid treating ordinary interactions as navigations.The adds
PerformanceSoftNavigationandInteractionContentfulPaintperformance entries so SPAs can measure interaction-driven same-document navigations and their contentful paints.It's a default in Chrome 151.
References
Note: We can enable
chrome://flags/#soft-navigation-heuristics, If we are on older versionsBefore
before.mp4
After
After_LCP.mp4