How accurate is the memory usage panel in stats.js?

The memory panel (MB) is accurate only in Chrome with the --enable-precise-memory-info flag enabled; it may not work in other browsers or without the flag, and it tracks allocated memory but not detailed garbage collection insights.

Can I use stats.js with React or Vue.js applications?

Yes, stats.js can be integrated into any JavaScript framework by adding it to component lifecycles or hooks—simply call begin() and end() around monitored code, similar to the basic usage example in the README.

How do I add a custom metric panel to stats.js?

Use the custom panel support by creating a new Stats instance, calling showPanel() with an index 3 or higher, and updating it in your animation loop with custom data, as implied in the README's code snippet.

Is stats.js suitable for production use?

Stats.js is designed for development and testing due to its visual overlay and minimal overhead; for production, consider more robust monitoring tools unless you need a lightweight, always-on display in controlled environments.

stats.js vs browser DevTools: which is better for performance debugging?

Stats.js offers real-time, always-on visual feedback perfect for quick checks during coding, while browser DevTools provide deeper, interactive profiling with more metrics and analysis tools—they serve different purposes, with Stats.js for immediacy and DevTools for thorough investigation.

How to remove the stats.js overlay from my page?

To remove the overlay, detach the stats.dom element from the DOM, for example by using document.body.removeChild(stats.dom) or hiding it with CSS, as it's a standard HTML element added during setup.

Open-Awesome

Stats.js

MITJavaScriptr17

A lightweight JavaScript library for real-time performance monitoring of frames per second, render time, and memory usage.

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9.1k stars1.2k forks0 contributors

What is Stats.js?

Stats.js is a lightweight JavaScript library that provides real-time performance monitoring for web applications. It displays key metrics like frames per second (FPS), render time in milliseconds (MS), and memory usage (MB) through an on-screen overlay, helping developers identify performance issues during development.

Target Audience

Web developers and game developers who need to monitor application performance in real-time, particularly those working on animations, interactive visualizations, or performance-critical applications.

Value Proposition

Developers choose Stats.js for its simplicity, zero dependencies, and immediate visual feedback—it can be added to any project with just a few lines of code and provides essential metrics without complex setup.

Overview

JavaScript Performance Monitor

Use Cases

Best For

Monitoring animation smoothness in WebGL or Canvas applications
Debugging performance bottlenecks in real-time interactive web apps
Testing memory usage patterns during development
Quick performance checks via bookmarklet on live websites
Comparing render performance across different browsers or devices
Adding lightweight performance overlays to game prototypes

Not Ideal For

Projects requiring detailed historical performance analytics or data export
Teams integrating performance monitoring into automated CI/CD testing pipelines
Applications needing cross-browser memory tracking without Chrome-specific flags

Pros & Cons

Pros

Minimal and Lightweight

Stats.js has zero dependencies and can be added with just a few lines of code, as shown in the README's simple installation and usage snippet.

Real-Time Visual Feedback

It provides immediate on-screen overlays for FPS, MS, and MB metrics, helping developers spot performance issues during development without complex setup.

Custom Panel Support

The library allows adding user-defined monitoring panels, enabling developers to track specific application metrics beyond the default ones, as mentioned in the features.

Easy Bookmarklet Injection

A provided bookmarklet lets developers inject Stats.js into any webpage for quick performance checks without modifying source code, ideal for ad-hoc testing.

Cons

Limited Metric Depth

It only covers basic metrics like FPS and render time, lacking advanced profiling features such as CPU usage, network activity, or frame-by-frame breakdowns.

Chrome-Dependent Memory Tracking

The MB panel requires running Chrome with the --enable-precise-memory-info flag, making it unreliable in other browsers or default setups, as noted in the README.

No Data Persistence

Metrics are displayed only in real-time with no built-in way to save, export, or log historical data for later analysis, limiting long-term debugging.

Frequently Asked Questions

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