Run results for: Image vs ImageBitmap with context2d

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0

Browser: Firefox 67

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Image	704504.4 Ops/sec
ImageBitmap	329461.5 Ops/sec

Script Preparation code:

var img = new Image();
var imageBitmap;
var doneLoading = false;
let canvas = document.createElement('canvas');
canvas.width = 640;
canvas.height = 480;
let canvas2 = document.createElement('canvas');
canvas2.width = 640;
canvas2.height = 480;

var ctx = canvas.getContext('2d');
var ctx2 = canvas2.getContext('2d');

img.addEventListener('load', function() {
  Promise.all([
    createImageBitmap(img)
  ]).then(function(images) {
  imageBitmap = images[0];
  doneLoading = true;
}, false);
});

img.src = 'https://1.bp.blogspot.com/-52MtzD0GfX0/WvP52CL1WjI/AAAAAAAAOVw/_OpK4JHeWK01d-7IiZ6vzojYGhXqLRXrACLcBGAs/s1600/EMxediL.jpg';

Tests:

Image
if (doneLoading) ctx.drawImage(img,0,0);
ImageBitmap
if (doneLoading) ctx2.drawImage(imageBitmap,0,0);

Run results for: Image vs ImageBitmap with context2d

Testing draw calls using a raw Image versus an ImageBitmap

Image

ImageBitmap