Run results for: Canvas cache or Path 2D (updated)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:137.0) Gecko/20100101 Firefox/137.0

Browser: Firefox 137

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Cached canvas	273.4 Ops/sec
Cached Path2D	3163.0 Ops/sec

HTML Preparation code:

<canvas height="500" width="500"/>
<canvas height="500" width="500"/>

Script Preparation code:

var [canvas1, canvas2] = Array.from(document.querySelectorAll('canvas'));
var ctx1 = canvas1.getContext('2d')
var ctx2 = canvas2.getContext('2d')
var rects = new Array(100).fill(null).map(() => ({
    x: Math.floor(Math.random() * 100),
    y: Math.floor(Math.random() * 100),
    width: Math.floor(Math.random() * 100) + 1,
    height: Math.floor(Math.random() * 100) + 1
}))

Tests:

Cached canvas
for (var rect of rects) { var cached = document.createElement('canvas') cached.width = rect.width cached.height = rect.height rect.cached = cached.getContext('2d') rect.cached.fillStyle = 'blue' rect.cached.fillRect(0, 0, rect.width, rect.height) ctx1.drawImage(rect.cached.canvas, rect.x, rect.y, rect.width, rect.height) } ctx1.clearRect(0, 0, 500, 500) for (var rect of rects) { ctx1.drawImage(rect.cached.canvas, rect.x, rect.y, rect.width, rect.height) }
Cached Path2D
for (var rect of rects) { rect.path = new Path2D() rect.path.rect(rect.x, rect.y, rect.width, rect.height) ctx2.fillStyle = rect.fill ctx2.fill(rect.path) } ctx2.clearRect(0, 0, 500, 500) for (var rect of rects) { ctx2.fillStyle = 'red' ctx2.fill(rect.path) }

Run results for: Canvas cache or Path 2D (updated)

Cached canvas

Cached Path2D