This rule is triggered when PageSpeed Insights detects that you are using a synchronous version of the script instead of an asynchronous version.

Overview

Using asynchronous scripts means that the system can render your web page more quickly, rather than forcing users to wait for the script to complete downloading before rendering the web page. Asynchronous version of the script can be downloaded in the background.

Although most of the original scripts are synchronous, newer versions of scripts can be loaded asynchronously.

Recommendations

請(qǐng)確保您使用的是異步版腳本。以下熱門(mén)腳本均支持加載異步腳本：

• BuySellAds (s3.buysellads.com/ac/bsa.js):Related blog post?- 默認(rèn)情況下為異步腳本
• ChartBeat (static.chartbeat.com/js/chartbeat.js):Related documents、相關(guān)博文?- 默認(rèn)情況下為異步腳本
• Clicky (static.getclicky.com/js)：相關(guān)博文
• Disqus (disqus.com/count.js, disqus.com/embed.js):Related documents、相關(guān)博文?- 默認(rèn)情況下為異步腳本
• Facebook (connect.facebook.net/.../all.js)：相關(guān)文檔、相關(guān)博文-Asynchronous script by default
• Google AdSense (pagead2.googlesyndication.com/pagead/show_ads.js) ：相關(guān)文檔、Related blog post
• Google Analytics (Analytics) (google-analytics.com/ga.js)：相關(guān)文檔、Related blog post?- 默認(rèn)情況下為異步腳本
• Google DFP廣告管理系統(tǒng)GPT (www.googletagservices.com/tag/js/gpt.js)：相關(guān)文檔
• Google + (apis.google.com/js/plusone.js)：相關(guān)文檔、相關(guān)博文
• New Relic (D7p9czrvs14ne. cloudfront.net/11/eum/rum.js)：相關(guān)文檔?- 默認(rèn)情況下為異步腳本
• Pinterest (assets.pinterest.com/js/pinit.js):相關(guān)文檔
• Shareaholic：相關(guān)文檔?- 默認(rèn)情況下為異步腳本
• ShareThis (w.sharethis.com/button/buttons.js):相關(guān)文檔
• ScorecardResearch/Comscore (b.scorecardresearch.com/beacon.js)：Related documents-Asynchronous script by default
• StumbleUpon (platform.stumbleupon.com/.../widgets.js)
• Quantcast (quantserve.com/quant.js):Related documents?- 默認(rèn)情況下為異步腳本
• Twitter (platform.twitter.com/widgets.js):Related documents-Asynchronous script by default
• Tynt (cdn.tynt.com/tc.js)
• Yandex (mc.yandex.ru/metrika/watch.js)

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