Measuring the back/forward cache with Application Metrics
Blog post from Sentry
Sentry’s opt-in bfcacheMetricsIntegration, introduced in JavaScript SDKs v11, makes browser back/forward cache behavior measurable through application metrics, addressing a gap in conventional page-load telemetry where successful instant restorations produce little or no trace. The browser’s bfcache preserves a page’s DOM, JavaScript state, and scroll position in memory, enabling near-instant back and forward navigation, while misses require a full reload that can harm user experience, particularly on slower devices or networks. Because cache eligibility can be affected by changing browser heuristics, application code, headers, connections, and embedded content, the integration tracks navigation outcomes, Chromium-specific reasons a page was not restored, and the duration of fallback reloads to show both causes and user impact. Teams can enable it with a single SDK integration and use custom dashboards to monitor hit rates, identify affected routes, investigate blocker reasons, and prioritize fixes, while Sentry plans to extend bfcache awareness into areas such as Core Web Vitals.
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