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Run results for:
Canvas clearing performance v3
https://stackoverflow.com/questions/2142535/how-to-clear-the-canvas-for-redrawing
Go to the benchmark
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=587271" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36 Edg/133.0.0.0
Browser:
Chrome 133
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Benchmark engine:
Benchmark.js
Clear only
1.0M/s
fillRect
680K/s
Save transform Clear restore
650K/s
w=w
525K/s
w+=0
518K/s
Canvas w with memo
2K/s
createImageData
409/s
View exact numbers
Test name
Executions per second
✓
Clear only
1,042,131 Ops/sec
fillRect
680,427 Ops/sec
Save transform Clear restore
649,934 Ops/sec
w=w
524,731 Ops/sec
w+=0
517,826 Ops/sec
Canvas w with memo
2,263 Ops/sec
createImageData
409 Ops/sec
HTML Preparation code:
<canvas id="canvasOne" width="1600" height="800"></canvas> <canvas id="canvasTwo" width="1600" height="800"></canvas> <canvas id="canvasThree" width="1600" height="800"></canvas> <canvas id="canvasFour" width="1600" height="800"></canvas>
Script Preparation code:
var canvasOne = document.getElementById("canvasOne"); var ctx = canvasOne.getContext("2d", {desynchronized: true, alpha: true, preserveDrawingBuffer: true}); var canvasTwo = document.getElementById("canvasTwo"); var ctxTwo = canvasTwo.getContext("2d"); var canvasThree = document.getElementById("canvasThree"); var ctxThree = canvasThree.getContext("2d"); var canvasFour = document.getElementById("canvasFour"); var ctxFour = canvasFour.getContext("2d");
Tests:
Clear only
ctx.fillStyle = 'rgba(255, 255, 255, 0.3)'; ctx.fillRect(0, 0, 400, 400); ctx.clearRect(0,0,ctx.canvas.width,ctx.canvas.height); ctx.beginPath(); ctx.fillStyle = 'rgba(231, 76, 60, 0.1)'; ctx.arc(200, 200, 100, 0, Math.PI * 2, true); ctx.fill();
Save transform Clear restore
ctx.fillStyle = 'rgba(255, 255, 255, 0.3)'; ctx.fillRect(0, 0, 400, 400); ctx.save(); ctx.setTransform(1,0,0,1,0,0); ctx.clearRect(0,0,ctx.canvas.width,ctx.canvas.height); ctx.restore(); ctx.beginPath(); ctx.fillStyle = 'rgba(231, 76, 60, 0.1)'; ctx.arc(200, 200, 100, 0, Math.PI * 2, true); ctx.fill();
Canvas w with memo
ctx.fillStyle = 'rgba(255, 255, 255, 0.3)'; ctx.fillRect(0, 0, 400, 400); var w = ctx.canvas.width; ctx.canvas.width = 1; ctx.canvas.width = w; ctx.beginPath(); ctx.fillStyle = 'rgba(231, 76, 60, 0.1)'; ctx.arc(200, 200, 100, 0, Math.PI * 2, true); ctx.fill();
w=w
ctx.fillStyle = 'rgba(255, 255, 255, 0.3)'; ctx.fillRect(0, 0, 400, 400); ctx.canvas.width = ctx.canvas.width; ctx.beginPath(); ctx.fillStyle = 'rgba(231, 76, 60, 0.1)'; ctx.arc(200, 200, 100, 0, Math.PI * 2, true); ctx.fill();
w+=0
ctx.fillStyle = 'rgba(255, 255, 255, 0.3)'; ctx.fillRect(0, 0, 400, 400); ctx.canvas.width += 0; ctx.beginPath(); ctx.fillStyle = 'rgba(231, 76, 60, 0.1)'; ctx.arc(200, 200, 100, 0, Math.PI * 2, true); ctx.fill();
fillRect
ctx.fillStyle = 'rgba(255, 255, 255, 0.3)'; ctx.fillRect(0, 0, 400, 400); ctx.fillStyle = 'rgba(0, 0, 0, 1)'; ctx.fillRect(0,0,ctx.canvas.width, ctx.canvas.height); ctx.beginPath(); ctx.fillStyle = 'rgba(231, 76, 60, 0.1)'; ctx.arc(200, 200, 100, 0, Math.PI * 2, true); ctx.fill();
createImageData
ctx.fillStyle = 'rgba(255, 255, 255, 0.3)'; ctx.fillRect(0, 0, 400, 400); var i = ctx.createImageData(ctx.canvas.width, ctx.canvas.height); ctx.putImageData(i, 0, 0); // clear context by putting empty image data ctx.beginPath(); ctx.fillStyle = 'rgba(231, 76, 60, 0.1)'; ctx.arc(200, 200, 100, 0, Math.PI * 2, true); ctx.fill();