Benchmark: Bug with Resizing ImageBitmap causes slower than expected performance - April 2025 Image

Bug with Resizing ImageBitmap causes slower than expected performance - April 2025 Image (version: 1)

There is currently a bug on Chrome Version 74.0.3729.131 (Official Build) (64-bit) (5/12/2019) with ImageBitmap where attempting to resize an ImageBitmap through ImageBitmapOptions will causes the resulting ImageBitmap to render very poorly when used with drawImage, even if the resulting ImageBitmap is resized to be smaller than the source image.

Comparing performance of: `Image vs ImageBitmap/Offscreen vs ImageBitmap/Offscreen Resized`

Created: one year ago by: Guest

Go to the latest result

Script Preparation code:

var img = new Image();
img.decoding = 'sync';

var imageBitmap;
var imageBitmapResized;
var doneLoading = false;
let canvas = document.createElement('canvas');

canvas.width = 640;
canvas.height = 480;
let canvas2 = document.createElement('canvas');
let offscreen = canvas2.transferControlToOffscreen();
offscreen.width = 640;
offscreen.height = 480;

var ctx = canvas.getContext('2d');
var ctx2 = offscreen.getContext('2d');

img.addEventListener('load', function() {
  
  Promise.all([
    createImageBitmap(img)
  ]).then(function(images) {
  imageBitmap = images[0];
  doneLoading = true;
}, false);
  
  Promise.all([
    createImageBitmap(img, {imageOrientation: "none", premultiplyAlpha: "none", resizeWidth:~~(img.width/2), resizeHeight:~~(img.height/2), resizeQuality:"low"})
  ]).then(function(images) {
  imageBitmapResized = images[0];
  doneLoading = true;
}, false);
  
});

img.src = 'https://fastly.picsum.photos/id/805/200/300.jpg?hmac=fF1qvNutYd9afa-FIuDfrsh7edNFRq6IXWnMbSuzSOs';

Tests:

Image
if (doneLoading) ctx.drawImage(img,0,0);
ImageBitmap/Offscreen
if (doneLoading) ctx.drawImage(imageBitmap,0,0);
ImageBitmap/Offscreen Resized
if (doneLoading) ctx.drawImage(imageBitmapResized,0,0);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Image
ImageBitmap/Offscreen
ImageBitmap/Offscreen Resized

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Mac OS X 10.15.7

View result in a separate tab

ImageBitmap/Offscreen

696K/s

Image

687K/s

ImageBitmap/Offscreen Resized

590K/s

View exact numbers

Test name	Executions per second
✓ ImageBitmap/Offscreen	695,518 Ops/sec
Image	687,456 Ops/sec
ImageBitmap/Offscreen Resized	590,431 Ops/sec