Want CNET to notify you of price drops and the latest stories?

Microsoft: IE9 best at sparing your laptop battery

Sharing measurements of actual power usage, Microsoft has concluded its browser is more energy-efficient than rivals' software.

Stephen Shankland principal writer
Stephen Shankland has been a reporter at CNET since 1998 and writes about processors, digital photography, AI, quantum computing, computer science, materials science, supercomputers, drones, browsers, 3D printing, USB, and new computing technology in general. He has a soft spot in his heart for standards groups and I/O interfaces. His first big scoop was about radioactive cat poop.
Expertise processors, semiconductors, web browsers, quantum computing, supercomputers, AI, 3D printing, drones, computer science, physics, programming, materials science, USB, UWB, Android, digital photography, science Credentials
  • I've been covering the technology industry for 24 years and was a science writer for five years before that. I've got deep expertise in microprocessors, digital photography, computer hardware and software, internet standards, web technology, and other dee
Stephen Shankland
2 min read
Microsoft's real-world power consumption measurements for several browsers.
Microsoft's real-world power consumption measurements for several browsers with a news site open. Microsoft

After some real-world tests, Microsoft has concluded IE9 is the most energy-efficient of the major browsers on the market.

Microsoft compared its new browser with Opera 11, Firefox 4, Chrome 10, and Safari 5 on an Intel laptop, measuring how many watts the machine consumed with the browser idling, showing a news site, and running graphics-intensive Web tests.

The upshot: IE9 is the most efficient in the test, meaning it'll take the smallest toll on the battery.

"We hope and encourage the industry and other browser vendors to follow us on the path to a more power efficient Web," said Walter VonKoch, Matthew Robben, and Jason Weber, three Microsoft personnel involved in power and performance matters.

There's plenty wiggle room in the study, of course--your mileage may vary in any number of ways. The tests were on Windows 7--but how does Safari fare on a Mac? IE9 has lots of hardware acceleration features that can reduce power consumption--but Firefox 4 and later other browsers offer some hardware acceleration on Windows XP, too. Microsoft's selection of Web sites may not represent the sites where you actually spend time. Different computers have different power consumption and power-saving characteristics. And of course in the real world, most people run more software than just a browser.

But the results are valuable nonetheless. I applaud Microsoft for setting up a test and for caring about power consumption.

It makes sense to cut power usage from an environmental and financial perspective, needless to say, but better battery life is more important for the average person. Students moving around campus and traveling businesspeople don't always have the luxury of a power outlet on hand.