Wordpress LScache Plugin: Google Console SharedArrayBuffers
Last Updated on: Wed, 15 Apr 2026 00:00:02 Hello, We recently updated Litespeed cache and we got this message from Google Search Console: (we are also using a LiteSpeed server). We manage other sites, but this is the only site that we manage that uses a Litespeed server with a Litespeed cache, and since this just came up after the most recent update we wanted to find out if this is related before we go on a hunt to try figure this out. Google Search Console: New requirements for SharedArrayBuffers Google systems have recently detected that SharedArrayBuffers (SABs) are used on your website, but COOP and/or COEP headers are not served. For Web Compatibility reasons Chrome is planning to require COOP/COEP for the use of SABs from Chrome 91 (2021-05-25) onwards. Please implement cross-origin-isolated behavior on your site. Our Litespeed report number: QULHAUGY Best regards, Hi, https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer it looks like something to do with JS and as of version 3.6.3 , I dont find this keyword in our source code , it must be coming from your other plugin/theme please try do a text search for this keyword Best regards, @CacheCrawler Hi, can you be more specific to which keyword you are suggesting? We have done several searches and found nothing yet. Best regards, this word SharedArrayBuffers Hi @CacheCrawler It seems that SharedArrayBuffer is used by React, which is used by Gutenberg, and probably other things. React has an outstanding issue for this: https://github.com/facebook/react/issues/20829 On our site we could not pinpoint the direct source of the SharedArrayBuffer. After doing some reading on the subject my understanding is that this can be mitigated if we add to the site header the following: Cross-Origin-Embedder-Policy: require-corp Cross-Origin-Opener-Policy: same-origin And we though about implementing this using. htaccess rule like this: # Cross-Origin-Embedder-Policy: require-corp Header set Cross-Origin-Embedder-Policy: require-corp # Cross-Origin-Opener-Policy: same-origin Header set Cross-Origin-Opener-Policy: same-origin Does implementing this affects in anyway the way Litespeed works? Best regards, Hi, no , these directive wont affect LSCWP Best regards, Hi @CacheCrawler Many thanks for the feedback.
LiteCache Rush: Speed comes from using less, not from doing it faster
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