Removing comment cookies Blog, The quest for page speed

Add this in your theme functions.php

/**
* Removes cookies set by comment form.
* Cookie usage disables your page cache
* @author    Ramon Fincken, MijnPress.nl
*/
function mp_cookie_remove()
{
setcookie('comment_author_' . COOKIEHASH, ", time() – 30000000, COOKIEPATH, COOKIE_DOMAIN);
setcookie('comment_author_email_' . COOKIEHASH, ", time() – 30000000, COOKIEPATH, COOKIE_DOMAIN);
setcookie('comment_author_url_' . COOKIEHASH, ", time() – 30000000, COOKIEPATH, COOKIE_DOMAIN);
}
add_action('init','mp_cookie_remove');