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/91.0.4472.124 Safari/537.36

Browser: Chrome 91

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Canvas	690566.1 Ops/sec
Offscreen	676257.7 Ops/sec
Canvas font	2049926.0 Ops/sec
Offscreen font	7605305.0 Ops/sec
Canvas textBaseline	5792971.0 Ops/sec
Offscreen textBaseline	5632533.0 Ops/sec
Canvas textAlign	6052957.0 Ops/sec
Offscreen textAlign	6010962.0 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