強制的にhttpにsをつけるスクリプトなんだけど、どうも動きに無駄がないかな？

(function(){
var url = window.location.href;

if(url.indexOf("http://")==0) {
window.location.replace(location.href.replace(url.substring(0,7), "https://"));
}

if(url.indexOf("https://")==0) {
for(var i=0,link; (link=document.links[i]); i++) {
if(link.href.indexOf("http://")==0) link.href = link.href.replace(link.href.substring(0,7), "https://");
}
}
})();