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           <h1>Chrome Content Optimization Service Runs on Go</h1>


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           <p>When the product Chrome comes to mind, you probably think solely of the
 user-installed browser. But behind the scenes, Chrome has an extensive fleet of
 backends. Among these is the Chrome Optimization Guide service. This service
 forms an important basis for Chrome&rsquo;s user experience strategy, operating in the
 critical path for users, and is implemented in Go.</p>

 <p>The Chrome Optimization Guide service is designed to bring the power of Google
 to Chrome by providing hints to the installed browser about what optimizations
 may be performed on a page load, as well as when they can be applied most
 effectively. It comprises a conjunction of real-time servers and batch logs
 analysis.</p>

 <p>All Lite mode users of Chrome receive data via the service through the following
 mechanisms: a data blob push that provides hints for well-known sites in their
 geography, a check-in to Google servers to retrieve hints for hosts that the
 specific user visits often, and on demand for page loads for which a hint is not
 already on the device. Were the Chrome Optimization Guide service to suddenly
 disappear, users might notice a dramatic change in the speed of their page loads
 and the amount of data consumed while browsing the web.</p>

 <div class="BackgroundQuote">
     <p class="BackgroundQuote-body">
       “Given that Go was a success for us, we plan to continue to use
 it where appropriate”
     </p>
     <div class="BackgroundQuote-author">
       <span>&mdash; Sophie Chang</span>
       ,&nbsp;
       <span class="BackgroundQuote-title">Software Engineer</span>
       </div>
     </div>


 <p>When the Chrome engineering team started building the service, only a few
 members had comfort with Go. Most of the team was more familiar with C++, but
 they found the complex boilerplate required to stand up a C++ server to be too
 much. The team shared that “[they] were pretty motivated to learn Go due to its
 simplicity, fast ramp-up, and ecosystem.” and that “[their] sense of adventure
 was rewarded.” Millions of users rely on this service to make their Chrome
 experience better, and choosing Go was no small decision. After their experience
 so far, the team also shared that “given that Go was a success for us, we plan
 to continue to use it where appropriate.”</p>

 <p>In addition to the Chrome Optimization Guide team, engineering teams across
 Google have adopted Go in their development process. Read about how the <a href="/solutions/google/coredata/">Core
 Data Solutions</a> and <a href="/solutions/google/firebase/">Firebase
 Hosting</a> teams use Go to build fast, reliable,
 and efficient software at scale.</p>

 <p><em>Editorial note: The Go team would like to thank Sophie Chang for her
 contributions to this story.</em></p>

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               <p class="CaseStudy-aboutBlockBody"><p>Google Chrome is a more simple, secure, and faster web browser than ever,
 with Google&rsquo;s smarts built-in.</p>

 <p>In this case study, the Chrome Optimization Guide
 team shared how they experimented with Go, ramped up quickly, and their plans to
 use Go going forward.</p>
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	<h1>Chrome Content Optimization Service Runs on Go</h1>


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	<p>When the product Chrome comes to mind, you probably think solely of the
	user-installed browser. But behind the scenes, Chrome has an extensive fleet of
	backends. Among these is the Chrome Optimization Guide service. This service
	forms an important basis for Chrome’s user experience strategy, operating in the
	critical path for users, and is implemented in Go.</p>

	<p>The Chrome Optimization Guide service is designed to bring the power of Google
	to Chrome by providing hints to the installed browser about what optimizations
	may be performed on a page load, as well as when they can be applied most
	effectively. It comprises a conjunction of real-time servers and batch logs
	analysis.</p>

	<p>All Lite mode users of Chrome receive data via the service through the following
	mechanisms: a data blob push that provides hints for well-known sites in their
	geography, a check-in to Google servers to retrieve hints for hosts that the
	specific user visits often, and on demand for page loads for which a hint is not
	already on the device. Were the Chrome Optimization Guide service to suddenly
	disappear, users might notice a dramatic change in the speed of their page loads
	and the amount of data consumed while browsing the web.</p>

	<div class="BackgroundQuote">
	<p class="BackgroundQuote-body">
	“Given that Go was a success for us, we plan to continue to use
	it where appropriate”
	</p>
	<div class="BackgroundQuote-author">
	<span>— Sophie Chang</span>
	,
	<span class="BackgroundQuote-title">Software Engineer</span>
	</div>
	</div>


	<p>When the Chrome engineering team started building the service, only a few
	members had comfort with Go. Most of the team was more familiar with C++, but
	they found the complex boilerplate required to stand up a C++ server to be too
	much. The team shared that “[they] were pretty motivated to learn Go due to its
	simplicity, fast ramp-up, and ecosystem.” and that “[their] sense of adventure
	was rewarded.” Millions of users rely on this service to make their Chrome
	experience better, and choosing Go was no small decision. After their experience
	so far, the team also shared that “given that Go was a success for us, we plan
	to continue to use it where appropriate.”</p>

	<p>In addition to the Chrome Optimization Guide team, engineering teams across
	Google have adopted Go in their development process. Read about how the <a href="/solutions/google/coredata/">Core
	Data Solutions</a> and <a href="/solutions/google/firebase/">Firebase
	Hosting</a> teams use Go to build fast, reliable,
	and efficient software at scale.</p>

	<p><em>Editorial note: The Go team would like to thank Sophie Chang for her
	contributions to this story.</em></p>

	</div>
	<div class="CaseStudy-contentAside">
	<div class="CaseStudy-aboutBlock">

	<img src="/images/logos/chrome.svg" class="CaseStudy-aboutBlockImg" alt="Chrome">
	<h3 class="CaseStudy-aboutBlockTitle">
	About Chrome
	</h3>

	<p class="CaseStudy-aboutBlockBody"><p>Google Chrome is a more simple, secure, and faster web browser than ever,
	with Google’s smarts built-in.</p>

	<p>In this case study, the Chrome Optimization Guide
	team shared how they experimented with Go, ramped up quickly, and their plans to
	use Go going forward.</p>
	</p>

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