Run results for: setFont measureText OffscreenCanvas vs Canvas

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Canvas	2218904.8 Ops/sec
Offscreen	2345505.8 Ops/sec
Canvas font	20308548.0 Ops/sec
Offscreen font	24483830.0 Ops/sec
Canvas textBaseline	18665862.0 Ops/sec
Offscreen textBaseline	18718866.0 Ops/sec
Canvas textAlign	23546512.0 Ops/sec
Offscreen textAlign	22766488.0 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