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It does matter when a lot of web browsing happens on mobile.

http://techland.time.com/2011/03/02/report-by-2015-mobile-in...

Majority of the mobile phones will only have access to 2G/3G speeds.

In a lot of countries, mobile data is metered. Saved bytes = saved money.

A cool option for mobile browsers, would be that an online service, could convert JPEG files into WebP. Then the mobile browser could be downloading the WebP file instead - that way saving money.

Opera (and others I think) does this with JPEG quality. They mirror the image files as far lower quality JPEG so as to improve speed for those on limited bandwidth. You can of course request the full files.

Correct. If you enable Turbo in Opera Mobile or desktop, all traffic is sent through a proxy server which converts images into WebP format. The quality is better than when we used jpegs and the file sizes are much smaller. (Disclaimer: I work for Opera)

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