Run results for: setFont measureText OffscreenCanvas vs Canvas

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.41 Safari/537.36 Edg/101.0.1210.32

Browser: Chrome 101

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Canvas	1263520.4 Ops/sec
Offscreen	1250957.9 Ops/sec
Canvas font	4153882.0 Ops/sec
Offscreen font	12888901.0 Ops/sec
Canvas textBaseline	10484311.0 Ops/sec
Offscreen textBaseline	10494906.0 Ops/sec
Canvas textAlign	10946671.0 Ops/sec
Offscreen textAlign	10665322.0 Ops/sec

Script Preparation code:

var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');

var offscreenCanvas = new OffscreenCanvas(0, 0);
var offscreenContext = offscreenCanvas.getContext('2d');

Tests:

Canvas
context.measureText('M');
Offscreen
offscreenContext.measureText('M');
Canvas font
context.font = 'bold 48px serif';
Offscreen font
offscreenContext.font = 'bold 48px serif';
Canvas textBaseline
context.textBaseline = "hanging";
Offscreen textBaseline
offscreenContext.textBaseline = "hanging";
Canvas textAlign
context.textAlign = "center";
Offscreen textAlign
offscreenContext.textAlign = "center";

Run results for: setFont measureText OffscreenCanvas vs Canvas

DomCanvas vs OffscreenCanvas

Canvas

Offscreen

Canvas font

Offscreen font

Canvas textBaseline

Offscreen textBaseline

Canvas textAlign

Offscreen textAlign