YandexMetrica会减慢网站速度吗？

使用异步加载代码或延迟加载Metrica代码可以减少对网站速度的影响。示例代码如下：

异步加载：

(function (d, w, c) {
    (w[c] = w[c] || []).push(function() {
        try {
            var yaCounter12345 = new Ya.Metrika({
                id:12345,
                clickmap:true,
                trackLinks:true,
                accurateTrackBounce:true,
                webvisor:true
            });
        } catch(e) { }
    });
    var n = d.getElementsByTagName("script")[0],
        s = d.createElement("script"),
        f = function () { n.parentNode.insertBefore(s, n); };
    s.type = "text/javascript";
    s.async = true;
    s.src = "https://mc.yandex.ru/metrika/watch.js";
    if (w.opera == "[object Opera]") {
        d.addEventListener("DOMContentLoaded", f, false);
    } else { f(); }
})(document, window, "yandex_metrika_callbacks");

延迟加载：

var yaMetricaLoad = function() {
    (function(d, w, c) {
        (w[c] = w[c] || []).push(function() {
            try {
                var yaCounter12345 = new Ya.Metrika({
                    id:12345,
                    clickmap:true,
                    trackLinks:true,
                    accurateTrackBounce:true,
                    webvisor:true
                });
            } catch(e) { }
        });
    var n = d.getElementsByTagName("script")[0],
        s = d.createElement("script"),
        f = function () { n.parentNode.insertBefore(s, n); };
        s.type = "text/javascript";
        s.async = true;
        s.src = "https://mc.yandex.ru/metrika/watch.js";
        if (w.opera == "[object Opera]") {
            d.addEventListener("DOMContentLoaded", f, false);
        } else {
            setTimeout(f, 5000);
        }
    })(document, window, "yandex_metrika_callbacks");
};
window.onload = yaMetricaLoad;