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Faster and lighter mobile pages from search

Information for website providers

Google shows faster, lighter pages to people searching on slow mobile connections in selected countries. To do this, we transcode (convert) web pages on the fly into a version optimized for slow networks, so that these pages load faster while saving data. These optimized pages preserve a majority of the relevant content and provide a link for users to view the original page. Our experiments show that optimized pages load four times faster than the original page and use 80% fewer bytes. Because these pages load so much faster, we also saw a 50% increase in traffic to these pages.

AMP pages requested from a locale that supports transcoding may also be modified to reduce load time. Modifications include font and image optimizations.

Here's an example of a web page being loaded with and without transcoding:

See the transcoded version of a web page

You can preview a transcoded version of a non-AMP webpage on your mobile device or desktop as described here:

Some pages are currently not transcoded, including video sites, pages that require cookies (such as personalized sites), and other websites that are technically challenging to transcode. In these cases, you will see a "not transcoded" notification if you request the transcoded page using one of the tools listed above.

Compare load times

You can see a side-by-side load comparison between a transcoded page and a non-transcoded page (this test takes a few minutes).

Opting out of transcoding

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.

Please note that pages that opt-out of being transcoded will be labeled in search results to indicate to users that they may take longer to load and may use more data.

FAQ

General

When will a user see these transcoded pages?

  • Users will see these pages only if Google has detected that they are on a slow network connection in a country in which we enable transcoding. 

Will Google Analytics work on my page?

  • Yes. Note that we support only page view statistics keep the pages small and fast-loading: for example, event tracking is not reported. Also we currently support only Universal Analytics (the analytics.js JavaScript library). 
    Metrics for the transcoded version of a page are shown in Analytics with googleweblight.com appended to the page's host name. So, if you have a page at example.com/mypage, metrics for the unencoded page are shown as example.com/mypage, and metrics for the transcoded page are shown as example.com.googleweblight.com/mypage.

Will my pages be transcoded for users on faster networks?

  • Pages will not be transcoded if the user is on a fast network.

Will my pages be transcoded for users doing searches from desktop computers or tablets?

  • Pages will be transcoded only for users on mobile phones, not desktop or tablets.

What browsers are supported? 

  • Pages are currently transcoded for searches from the Chrome browser and the Android browser (version 2.3+).

How do I provide feedback about these optimized pages?

Do you cache my transcoded page?

  • Pages are generally transcoded when the user requests them, from the current version of the page. Google caches the main content for a only a few minutes. Other resources such as CSS, JS and images could be cached longer.

Do you transcode just the page linked by search results, or do you transcode the whole site?

We transcode the page and any pages that the user clicks to from within that page, unless the page is non-transcodable or opted out from transcoding.

Ads and Revenue

How will this affect my ad revenue? 

  • We currently support ads from several networks and are working to include more. Our experiments show that transcoded sites get 50% more traffic than non-transcoded sites and we expect that this will help monetize your site.

What ad networks are currently supported? 

  • As of May 2015, we support Sovrn, Zedo, and AdSense. We are working to support DoubleClick for Publishers (DFP) and more ad networks as well.

How many ads are shown on a single page?

  • To keep the page size down and make pages load faster, we limit the number of ads shown on a single page. Currently this limit is set at 3. 

I use multiple ad networks. How does Google select which ads are shown?

  • Ads are currently chosen in the order in which they are requested by the original page.

I'm an ad network and my network is not supported. How can I get added?

Opt-out

What happens if I opt out of transcoding?

  • If you opt out, Google will not transcode your page for users on slow network connections. If you opt-out of being transcoded, we will label this page in the search results to indicate to users that non-transcoded pages may take longer to load and may use more data. 

I didn't opt out, why is my page not transcoded?

  • Due to technical limitations, some pages cannot be currently transcoded. These pages will also be labeled as non-transcoded in search results. This includes: 
    • Sites that require cookies (e.g. personalized site or sites that require you to login before using them) 
    • Sites that use a significant amount of data (e.g. video sites)
    • Other sites that are technically difficult to transcode.
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