The optional feature, essentially a Google proxy, routes web requests through Google’s servers where the company’s PageSpeed libraries compress and optimize the content. Meanwhile, the actual connection between the browser and Google’s servers is handled by the SPDY protocol for further optimization.
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Reduce data usage

Chrome can reduce the amount of data you use by up to 50%. To reduce the amount of data that you use, Chrome uses Google’s servers to condense image file sizes and perform other optimizations. Only HTTP requests are sent to Google’s servers; HTTPS requests are made directly to the destination server. Also, pages loaded in Incognito tabs are not loaded through Google’s servers.

You can see how much data you saved over the last 30 days in the Chrome settings menu when “Reduce Data Usage” is turned on. Your data savings will depend on several factors:
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• The type of content on the websites you visit.
• The number of sites visited that can be optimized. Secured sites (that have HTTPS in the website address) and pages visited using Incognito mode are not optimized.
• When you use this feature, Chrome also uses Safe Browsing technology to protect you from malware and phishing attacks. Chrome will warn you if you’re about to visit a dangerous site.

You can choose when want to reduce data usage:

1. Touch Chrome menu > Settings > (Advanced) Bandwidth management.
2. Touch Reduce data usage and slide the switch ON or OFF.

you’re agreeing to route all your HTTP traffic through Google’s proxy servers. (The feature is disabled for HTTPS and “Incognito” mode traffic, though)
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So friends download latest version of Google Chrome Android Browser from Google Play.