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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

請確保您使用的是異步版腳本。以下熱門腳本均支持加載異步腳本：

  • BuySellAds (s3.buysellads.com/ac/bsa.js):Related blog post?- 默認情況下為異步腳本
  • ChartBeat (static.chartbeat.com/js/chartbeat.js):Related documents、相關博文?- 默認情況下為異步腳本
  • Clicky (static.getclicky.com/js)：相關博文
  • Disqus (disqus.com/count.js, disqus.com/embed.js):Related documents、相關博文?- 默認情況下為異步腳本
  • Facebook (connect.facebook.net/.../all.js)：相關文檔、相關博文-Asynchronous script by default
  • Google AdSense (pagead2.googlesyndication.com/pagead/show_ads.js) ：相關文檔、Related blog post
  • Google Analytics (Analytics) (google-analytics.com/ga.js)：相關文檔、Related blog post?- 默認情況下為異步腳本
  • Google DFP廣告管理系統(tǒng)GPT (www.googletagservices.com/tag/js/gpt.js)：相關文檔
  • Google + (apis.google.com/js/plusone.js)：相關文檔、相關博文
  • New Relic (D7p9czrvs14ne. cloudfront.net/11/eum/rum.js)：相關文檔?- 默認情況下為異步腳本
  • Pinterest (assets.pinterest.com/js/pinit.js):相關文檔
  • Shareaholic：相關文檔?- 默認情況下為異步腳本
  • ShareThis (w.sharethis.com/button/buttons.js):相關文檔
  • 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)
AttentionWe will try our best to update the above list in time. However, if you have specific questions about third-party scripts, or if you do not find an asynchronous version of scripts here, we recommend that you contact the provider directly.

對于Remove JavaScript that blocks renderingWe also provide more information about the reasons for speeding up the rendering of web pages.

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