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();

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

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Latest run results:

Run details: (Test run date: 22 days ago)

User agent: Mozilla/5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser/OS: Chrome 129 on Chrome OS 14541.0.0

View result in a separate tab

Test name	Executions per second
Clear only	269638.7 Ops/sec
Save transform Clear restore	179744.4 Ops/sec
Canvas w with memo	1697.4 Ops/sec
w=w	73407.0 Ops/sec
w+=0	82066.4 Ops/sec
fillRect	290630.1 Ops/sec
createImageData	249.1 Ops/sec

Related benchmarks:

Canvas clearing performance v3 (version: 2)

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: 3 years ago by: Registered User

Jump to the latest result

Clear only

Save transform Clear restore

Canvas w with memo

w=w

w+=0

fillRect

createImageData

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):