Google renders weblight versions of few of our pages intermittently, and that kills all interactivity. Optimizing the pages to the fullest is ofcourse a method to lessen weblight transformation, we want to avoid it completely. As mentioned in the documentation, we intend to send no-transform response header in our pages to signal Google to not generate a weblight version of the pages.

Opting out of Web Light If you do not want your pages to be transcoded, set the HTTP header "Cache-Control: no-transform" in your page response. If Googlebot sees this header, your page will not be transcoded.

My question is that is there any possible SEO effect we shall be cautious about due to this ?

1 Answer 1


I have sites that also opt out of Google Weblight as the cart doesn't function so nothing can be purchased.

I have seen no adverse effect since we added the "Cache-Control: no-transform" header, no drop in mobile traffic, CR, or anything else.

Google mention that your site may be marked as slow in the mobile SERPS, but I have only seen this when using a really slow mobile connection, think edge speed.

I also doubt many people pay attention to this warning anyway.


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