stats.js

JavaScript Performance Monitor

This class provides a simple info box that will help you monitor your code performance.

• FPS Frames rendered in the last second. The higher the number the better.
• MS Milliseconds needed to render a frame. The lower the number the better.

Screenshots

Usage

var stats = new Stats();
stats.setMode(1); // 0: fps, 1: ms

// Align top-left
stats.domElement.style.position = 'absolute';
stats.domElement.style.left = '0px';
stats.domElement.style.top = '0px';

document.body.appendChild( stats.domElement );

setInterval( function () {

	stats.begin();

	// your code goes here

	stats.end();

}, 1000 / 60 );

Bookmarklet

Albeit theorically not as accurate the widget can also be easily inserted to any site using a bookmarklet. Follow the instructions.

Change Log

2012 05 10 - r10 (2,243 KB, gzip: 903 B)

• Changed .getDomElement() to .domElement back.
• Removed .getFps(), .getFpsMin(), .getFpsMax(), .getMs(), .getMsMin(), .getMsMax().
• Added .begin() and .end().
• Added .setMode().
• Themeable with CSS.

2012 01 18 - r9 (2,872 KB, gzip: 1,038 KB)

• Changed .domElement to .getDomElement()
• Added .getFps(), .getFpsMin(), .getFpsMax(), .getMs(), .getMsMin(), .getMsMax().

2011 10 16 - r8 (2.670 KB, gzip: 987 B)

• Performance and size optimizations.
• Removed memory mode.

2011 10 13 - r7 (4.083 KB, gzip: 1.377 KB)

• Replaced new Date().getTime() with Date.now().

2011 05 28 - r6 (4.103 KB, gzip: 1.384 KB)

• Updated check for memory accesible browsers.
• Renamed MEM to MB for consistency reasons.

2010 09 21 - r5 (3.800 KB)

• Different color per mode.
• Added MEM mode. (Webkit-based browsers only)
• Force text left aligned.

2010 06 11 - r4 (2.235 KB)

• Added MS mode.

2010 05 12 - r3 (1.241 KB)

• Switched to module pattern code style.
• Removed position = 'absolute'.

2010 03 01 - r2 (2.177 KB)

• Simplified.

2010 02 21 - r1

• Accurate FPS calculation. (thx @spite!)

2009 08 09 - r0

• Base code.