This rule is triggered when PageSpeed Insights detects that you are using a synchronous version of the script instead of an asynchronous version.
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.
请确保您使用的是异步版脚本。以下热门脚本均支持加载异步脚本：
- BuySellAds (
s3.buysellads.com/ac/bsa.js):Related blog post - 默认情况下为异步脚本 - ChartBeat (
static.chartbeat.com/js/chartbeat.js):Related documents、相关博文 - 默认情况下为异步脚本 - Clicky (
static.getclicky.com/js)：相关博文 - Disqus (
disqus.com/count.js, disqus.com/embed.js):Related documents、相关博文 - 默认情况下为异步脚本 - Facebook (
connect.facebook.net/.../all.js)：相关文档、相关博文-Asynchronous script by default - Google AdSense (
pagead2.googlesyndication.com/pagead/show_ads.js) ：相关文档、Related blog post - Google Analytics (Analytics) (
google-analytics.com/ga.js)：相关文档、Related blog post - 默认情况下为异步脚本 - Google DFP广告管理系统GPT (
www.googletagservices.com/tag/js/gpt.js)：相关文档 - Google + (
apis.google.com/js/plusone.js)：相关文档、相关博文 - New Relic (
D7p9czrvs14ne. cloudfront.net/11/eum/rum.js)：相关文档 - 默认情况下为异步脚本 - Pinterest (
assets.pinterest.com/js/pinit.js):相关文档 - Shareaholic：相关文档 - 默认情况下为异步脚本
- ShareThis (
w.sharethis.com/button/buttons.js):相关文档 - 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 - 默认情况下为异步脚本 - 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)
对于Remove JavaScript that blocks renderingWe also provide more information about the reasons for speeding up the rendering of web pages.
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