RUM Performance
RUM > Performance summarizes Web Vitals and error trends across an application, without requiring you to build a query in the Explorer. Scope it with the Application filter and the time range picker, and drill deeper on the facet sidebar. It has three tabs: Overview, Performance, and Errors.
Overview
The Overview tab shows Page performance, a chart that breaks down p50/p75/p90/p95/p99 loading time by page (view.name), plus five metric tiles for the selected percentile:
- Largest Contentful Paint (LCP)
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Time until the largest visible element finishes rendering.
- Cumulative Layout Shift (CLS)
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How much visible content shifts unexpectedly during load.
- Interaction to Next Paint (INP)
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Responsiveness to user interaction across the page’s lifetime.
- First Contentful Paint (FCP)
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Time until the first piece of content renders.
- Loading Time
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Overall time for the view to finish loading.
Below the tiles, Worst pages lists the pages with the slowest LCP, largest CLS, and longest INP, letting you jump straight to the problem views.
Performance
The Performance tab breaks the same Web Vitals down further, with response time and throughput split by Page Loads (full navigations) versus Route Changes (single-page-application transitions), each metric tile showing a Load performance breakdown into Good / Needs improvement / Poor buckets against industry-recommended baselines. A Top pages table ranks pages by loading time, LCP, CLS, and INP so you can see which routes need attention.
Errors
The Errors tab summarizes frontend errors impacting the application: Total Errors over time, Errors by Version, and Error rate (%) for Views with most errors, plus two tables — Actions triggering errors (which user interactions most often precede an error) and Ongoing issues (grouped errors with type, service, occurrence count, and last-seen time). Selecting an error group opens the same detail as Errors.