Real User Monitoring (RUM) for production web performance
Measure how real users experience your production website. Continuous field telemetry capturing p75 Core Web Vitals, device capabilities, and network conditions.
Synthetic lab tests don't reflect production reality
Lighthouse and synthetic bot tests run on pristine server connections and high-end hardware, completely missing real-world slowdowns experienced by actual users.
- xLab tests fail to capture real interaction responsiveness (INP) across diverse devices
- xRegional network throttles and 4G/3G cell towers degrade loading (LCP) unpredictably
- xDynamic web applications and user ads trigger layout instability (CLS) after initial paint
- xEngineering teams lack route-by-route visibility into which pages are failing Google ranking thresholds
Continuous real user field telemetry
Open Analytics embeds directly in real visitor browsers, measuring native W3C Performance Timeline events with zero main-thread overhead.
How browser-native RUM operates
Zero-overhead PerformanceObserver listeners capture Web Vitals metrics at the precise moment they occur.
W3C PerformanceObserver API
The script hooks into native browser observers for `largest-contentful-paint`, `layout-shift`, `event` (for INP), and `navigation` timing.
Passive In-Memory Collation
Metrics are buffered without locking main-thread execution. INP calculates the worst interaction latency across all user clicks and key presses.
Reliable Non-Blocking Delivery
When the visitor navigates away or hides the tab, telemetry dispatches atomically via `navigator.sendBeacon` or deferred fetch.
Production Use Cases
How engineering and growth teams rely on Open Analytics in production.
SEO Core Web Vitals Protection
Audit and verify that your pages pass Google's Page Experience ranking signals before algorithm updates hit your organic traffic.
Single Page App Route Profiling
Compare soft navigation transitions against hard document reloads to optimize client-side data fetching and bundle splitting.
Mobile vs Desktop Diagnostics
Isolate whether performance bottlenecks stem from mobile device CPU limitations or high-latency cellular connections.
Captured Signals & Benchmarks
Precision telemetry captured with zero browser performance overhead.
| Signal | Unit | Benchmark | Description |
|---|---|---|---|
| LCP (Largest Contentful Paint) | Seconds | < 2.5s Good | Time taken to render the largest visible image, video poster, or text block on the viewport. |
| INP (Interaction to Next Paint) | Milliseconds | < 200ms Good | Measures overall responsiveness by tracking the latency of all user clicks, taps, and key presses. |
| CLS (Cumulative Layout Shift) | Unitless Score | < 0.1 Good | Quantifies unexpected layout movements caused by unsized images, dynamic ads, or late font swaps. |
| TTFB (Time to First Byte) | Milliseconds | < 800ms Good | Time between the browser's initial HTTP request and the arrival of the first byte of server response. |
Privacy by Design & GDPR Exemption
Open Analytics processes telemetry without invasive user surveillance.
- Performance timings contain purely technical device metrics with zero personal data
- No user keystrokes, form inputs, or screen coordinates are recorded
- Hardware information is strictly limited to standard browser navigator APIs
- Fully compliant with GDPR and enterprise security standards
<!-- Included automatically with standard script tag --> <script defer src="https://api.openanalytics.org.in/open.js" data-project-id="YOUR_PROJECT_ID" ></script>
Async non-blocking beacon weighing <3.2 KB Brotli compressed.
Frequently Asked Questions
Start capturing precision telemetry in 60 seconds
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