Run results for: img src slowness

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0

Browser: Firefox 115

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Clone without src

2.1M/s

Creation without src

1.7M/s

Clone with src

59K/s

Creation with src

56K/s

View exact numbers

Test name	Executions per second
✓ Clone without src	2,068,621 Ops/sec
Creation without src	1,711,782 Ops/sec
Clone with src	58,786 Ops/sec
Creation with src	56,188 Ops/sec

Script Preparation code:

function makeImage( src ) {
  var img = document.createElement( 'img' );
  img.className='nail';
  if ( src ) {
    img.src='data:image/gif;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=';
  }
  return img;
}

withSrc = makeImage( true );
withoutSrc = makeImage( false );

Tests:

Creation with src
makeImage( true );
Creation without src
makeImage( false );
Clone with src
withSrc.cloneNode();
Clone without src
withoutSrc.cloneNode();

Run results for: img src slowness

Creating image tags with/without an src attribute with a data URI.

Creation with src

Creation without src

Clone with src

Clone without src