Presumably loaded plug-ins
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A comprehensive look at the Speculation Rules API in WordPress and its implications
To take advantage of the Speculation Rules API in WordPress, the WordPress performance team (including developers from Google) recently released a speculation loading plugin. This plugin pre-loads the front-end URLs of the links on a page to improve page loading speed. By default, this plugin pre-renders the WordPress front-end URL when the user hovers over the relevant link.You can ...