www programming

function srcset_remove( $sources ) {
	  return false; // this will nullify srcset added to img tag on images since wp 4.4 
	  // todo: return correct value for the wp_calculate_image_srcset filter
}

add_filter( 'wp_calculate_image_srcset', 'srcset_remove' );

To solve all problems reported here:
[url]https://make.wordpress.org/core/2015/11/10/responsive-images-in-wordpress-4-4/[/url]
[code]function srcset_remove( $sources ) {
return false; // this will nullify srcset added to img tag on images since wp 4.4
// todo: return correct value for the wp_calculate_image_srcset filter
}

add_filter( 'wp_calculate_image_srcset', 'srcset_remove' );[/code]

You may would like to run this, only for old posts with date prior your WP update to 4.4 or >