JavaScript execution waterfalls
Track script parsing, compilation, and execution timing across main thread bottlenecks in real user JavaScript application sessions.
JavaScript Error and Performance Monitoring
Get complete visibility into your JavaScript errors and performance issues that are impacting your end user experience. Fix critical issues sooner with in depth data points that helps you in analyzing and resolving issues with great speed.
Challenges
Achieve comprehensive visibility into JavaScript execution and browser rendering pipelines
Dynamic import & module loading
Monitor ES6 module imports, dynamic import() waterfalls, and code splitting performance in modern JavaScript single page applications.
Event loop blocking analysis
Measure long tasks, task queue delays, and microtask execution timing affecting JavaScript application responsiveness.
JavaScript runtime error capture
Capture unhandled promise rejections, async generator failures, and syntax errors with complete call stack traces.
Synthetic event performance
Profile addEventListener delays, event delegation overhead, and passive event listener effectiveness in web applications.
Main thread to user correlation
Connect JavaScript long tasks directly to input delays, layout thrashing, and Core Web Vitals impact.
Memory leak detection
Track closure leaks, detached DOM nodes, and growing WeakMap instances across JavaScript application lifecycles.
JavaScript bundle optimization
Validate tree shaking effectiveness, dead code elimination, and bundle duplication patterns in production deployments.
Execution and Event Loop Processing
- Measure script execution frequency during real user interactions and correlate execution cost with actual UI update latency to understand performance impact.
- Analyze event loop behavior across the call stack, microtasks, macrotasks, and scheduling phases to surface execution bottlenecks.
- Identify long-running scripts and heavy synchronous tasks that block rendering and delay interaction readiness.
- Detect repeated execution cycles triggered without meaningful state changes that create unnecessary CPU overhead.
DOM Manipulation and Rendering Execution
- Measure latency between DOM updates and final visual rendering across complex user interactions to clearly understand render pipeline performance.
- Identify excessive DOM reads, writes, and style recalculations that trigger layout thrashing, forced reflows, and UI instability.
- Analyze reflow and repaint timing during dynamic UI updates, animations, and responsive layout changes to pinpoint expensive rendering steps.
- Correlate DOM execution timing with interaction responsiveness, dropped frames, scrolling smoothness, and visual stability issues.
Asynchronous Execution and Network Handling
- Track asynchronous operations from API requests, promises, timers, web workers, and event-driven workflows.
- Measure the delay between async task completion and the resulting UI updates triggered by state changes.
- Identify concurrent async execution paths that compete for main thread resources and block rendering.
- Correlate async execution timing with navigation latency, workflow interruption, and perceived performance.
Memory and Resource Execution
- Measure memory allocation patterns and garbage collection timing during intensive script execution phases.
- Identify memory leaks caused by lingering event listeners, retained closures, detached DOM nodes, and unused objects.
- Analyze resource loading impact including scripts, images, and third-party assets on execution and rendering performance.
- Correlate resource execution timing with UI lag, responsiveness issues, and long task occurrences.
Why Atatus
Why Choose Atatus for JavaScript RUM?
Master JavaScript main thread performance, event loop optimization, and modern module loading without framework dependencies.
01
Built for all JavaScript applications
Native monitoring of V8/SpiderMonkey/JSC engines, event loop scheduling, and DOM scripting performance across any JavaScript web app.
02
Universal JavaScript diagnostics
Execution waterfalls, long task traces, and memory timeline analysis across all JavaScript environments.
03
Zero-config script integration
Single script tag deployment monitors any JavaScript application—framework agnostic, build tool independent.
04
Pure JavaScript Core Web Vitals
LCP/CLS/INP metrics attributed to script execution, event handlers, and main thread blocking patterns.
05
Universal web app scaling
Enterprise-grade monitoring for custom JavaScript SPAs, micro-frontends, and legacy web applications.
06
JavaScript growth pricing
Scalable costs track JavaScript execution across user sessions—no framework licensing or migration costs.
Teams
Unified Observability for Every Engineering Team
Atatus adapts to how engineering teams work across development, operations, and reliability.
Developers
Debug errors and slow paths with the full context of what happened.
Atatus for developersDevOps
Track deployments and see how each release affects stability.
Atatus for DevOpsRelease engineers
Watch latency and error rates to ship with less production risk.
Atatus for release engineers
FAQ
Frequently Asked Questions
Pricing, deployment, data and the agent. If something is missing, a person will answer it on a demo call.
JavaScript performance monitoring collects in-depth metrics on each user-interaction and analyzes everything from page load events to HTTP requests to front-end application crashes.
Monitoring JavaScript apps helps you to pinpoint JavaScript issues, measure user experience with the key metrics provided and fix them as soon as possible.
In real-time monitoring, a small piece of code is injected into the application to collect metrics while it is in use.
The browser-based applications can be monitored by injecting a JavaScript code which tracks and detects the front-end performance issues along with the XHR requests.
It also provides you with in-depth front-end metrics which helps you in resolving the issues at a faster rate.
Atatus Real User Monitoring supports front-end frameworks such as JavaScript, AngularJS, Angular, React, Backbone, Ember, Vue, Ionic, Ionic2+ and Meteor.
Also, you can embed the JavaScript snippet in a web page inside the tag and monitor.
Yes, we collect the IP address of the browser client used by the user, which will be displayed in the users' information along with the page views, load time, error count and last seen of the user, respectively.
Yes, we do collect core web vitals metrics such as:
- First Contentful Paint (FCP)
- Last Contentful Paint (LCP)
- First Input Delay (FID)
- Cumulative Layout Shift (CLS)
- Time To First Byte (TTFB)
As part of Atatus Browser Monitoring, we have a Single Page Application (SPA) Monitoring feature that gives a 360-degree view of what customers are doing with single-page apps and AJAX-based apps.
The benefits of real-time monitoring of users are substantial.
- It provides actual end-user experiences
- Easily track high value pages
- RUM metrics can determine whether service level agreements (SLAs) are being met, and to determine how users interact with an application and how developers can simplify the user interface.
Compared to all other browser monitoring tools Atatus offers affordable pricing plans. Collaboration requires in any monitoring tool so we do not limit your capabilities by charging per user.
We collect all the data points including Spans and Traces that are necessary for you without the need for you to select which to retain. With this you can easily monitor your entire application.
Rather than stop collecting the front-end performance metrics, our sales team will contact you to discuss the requirements.
Start free and send your first trace with OpenTelemetry or the Atatus agents. APM, logs, RUM, infrastructure and SIEM, all on one timeline.
- SaaS
- On-premises
- Hybrid
- BYOC
- No per-user pricing