Benchmark: Canvas clearing performance v3

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();

Historical Performance Data aggregated from 38 community runs

Desktop Results:

Firefox 21 runs

Save transform Clear restore

142K/s

Clear only

85K/s

fillRect

9K/s

Canvas w with memo

9K/s

w+=0

3K/s

w=w

3K/s

createImageData

188/s

Fastest: Save transform Clear restore (754.3x faster)

View exact numbers

✓ Save transform Clear restore: 142,011 ops/sec
• Clear only: 85,456 ops/sec
• fillRect: 8,773 ops/sec
• Canvas w with memo: 8,705 ops/sec
• w+=0: 3,393 ops/sec
• w=w: 3,151 ops/sec
• createImageData: 188 ops/sec

Chrome 17 runs

Clear only

1.0M/s

Save transform Clear restore

624K/s

w+=0

565K/s

w=w

525K/s

fillRect

474K/s

Canvas w with memo

3K/s

createImageData

408/s

Fastest: Clear only (2556.3x faster)

View exact numbers

✓ Clear only: 1,042,131 ops/sec
• Save transform Clear restore: 623,678 ops/sec
• w+=0: 564,702 ops/sec
• w=w: 524,731 ops/sec
• fillRect: 473,716 ops/sec
• Canvas w with memo: 2,702 ops/sec
• createImageData: 408 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Clear only
Save transform Clear restore
Canvas w with memo
w=w
w+=0
fillRect
createImageData

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36

Browser/OS: Chrome 149 on Linux

View result in a separate tab

Clear only

818K/s

Save transform Clear restore

546K/s

fillRect

538K/s

w=w

503K/s

w+=0

484K/s

Canvas w with memo

8K/s

createImageData

349/s

View exact numbers

Test name	Executions per second
✓ Clear only	818,270 Ops/sec
Save transform Clear restore	545,847 Ops/sec
fillRect	537,595 Ops/sec
w=w	502,957 Ops/sec
w+=0	484,405 Ops/sec
Canvas w with memo	8,338 Ops/sec
createImageData	349 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Canvas clearing performance v3 (version: 2) Benchmark.js

https://stackoverflow.com/questions/2142535/how-to-clear-the-canvas-for-redrawing

Comparing performance of: `Clear only vs Save transform Clear restore vs Canvas w with memo vs w=w vs w+=0 vs fillRect vs createImageData`

Created: 5 years ago by: Registered User

Go to the latest result

Clear only

Save transform Clear restore

Canvas w with memo

w=w

w+=0

fillRect

createImageData

Historical Performance Data aggregated from 38 community runs

Desktop Results:

Firefox 21 runs

Chrome 17 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

Canvas clearing performance v3 (version: 2) Benchmark.js

https://stackoverflow.com/questions/2142535/how-to-clear-the-canvas-for-redrawing

Comparing performance of: Clear only vs Save transform Clear restore vs Canvas w with memo vs w=w vs w+=0 vs fillRect vs createImageData

Created: 5 years ago by: Registered User

Go to the latest result

Clear only

Save transform Clear restore

Canvas w with memo

w=w

w+=0

fillRect

createImageData

Historical Performance Data aggregated from 38 community runs

Desktop Results:

Firefox 21 runs

Chrome 17 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

Related benchmarks

Comparing performance of: `Clear only vs Save transform Clear restore vs Canvas w with memo vs w=w vs w+=0 vs fillRect vs createImageData`