Upload thousands of images to WordPress without plugin?

I’ve modified method wp_update_attachment_metadata from wp-includes/post.php (line 5070) to this, just during the Import:

/**
 * Update metadata for an attachment.
 *
 * @since 2.1.0
 *
 * @param int   $attachment_id Attachment post ID.
 * @param array $data          Attachment meta data.
 * @return int|bool False if $post is invalid.
 */
function wp_update_attachment_metadata( $attachment_id, $data ) {
    $attachment_id = (int) $attachment_id;
    if ( ! $post = get_post( $attachment_id ) ) {
        return false;
    }

    /**
     * Filters the updated attachment meta data.
     *
     * @since 2.1.0
     *
     * @param array $data          Array of updated attachment meta data.
     * @param int   $attachment_id Attachment post ID.
     */
     return update_post_meta( $post->ID, '_wp_attachment_metadata', $data );
}

Media Upload Before:

  'uploadtimedebug_start' => 0 seconds
  'uploadtimedebug_after_requires' => 0.006 seconds
  'uploadtimedebug_after_tmp_filled' => 0.597 seconds
  'uploadtimedebug_before_media_handle_sideload' => 0.597 seconds
  'uploadtimedebug_after_media_handle_sideload' => 5.370 seconds
  'uploadtimedebug_finish' => 5.370 seconds

Media Upload After:

  'uploadtimedebug_inicio' => 0 seconds
  'uploadtimedebug_after_requires' => 0.007 seconds
  'uploadtimedebug_after_tmp_filled' => 0.620 seconds
  'uploadtimedebug_before_media_handle_sideload' => 0.620 seconds
  'uploadtimedebug_after_media_handle_sideload' => 0.723 seconds
  'uploadtimedebug_finish' => 0.723 seconds

No side effects, everything works just fine. Keep in mind though, that this should be a temporary hack, when you’re done uploading your thousand images, revert wp_update_attachment_metadata to it’s original code.

Edit – Please ignore everything I said.

The culript was the plugin “Smush It”, hooked into the wp_update_attachment_metadata filter. Upon disabling Smush It, the filter took zero seconds.

Edit – Please ignore everything I said.

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