The Test

Overall, many factors go into web browser battery usage, like GPU accelerated rendering and content caching. Chrome, despite its aggressive timer usage, may still be more battery efficient than other browsers. I should note that AnandTech has historically used Safari on OS X and desktop IE on Windows devices when performing battery life testing.

With this article we are debuting a new browser benchmark tool. Developed in house, this tool automates the usage of a desired web browser as if a user was sitting at the computer. It performs common tasks like launching and closing the browser, opening and closing tabs, loading websites, and scrolling through longer articles. As usual, the websites visited are popular sites cached on the AnandTech server, so the content of the sites does not change between runs. Additionally, the browsers are all run in private browsing mode to prevent local content caching from interfering with reloading our limited set of server-cached sites.

Browsers tested:

  • IE11 Desktop Mode v11.0.9600.17207 (Update versions: 11.0.10 KB2962872)
  • IE11 Modern (Metro) Mode
  • Firefox 31.0
  • Safari 5.1.7
  • Chrome 36.0.1985.125 m
  • Chrome 37.0.2062.68 beta-m (64-bit)

There are several other browsers we would have liked to test, however, due to the time intensive nature of battery life testing, we chose to focus on the most popular browsers. We also chose to test the beta version of Chrome as it is a significant update. Chrome 37 changes from 32-bit to 64-bit and from GDI (legacy) rendering to DirectWrite (modern) rendering. This makes the browser actually usable and no longer blurry on HiDPI displays.

To take advantage of operating system and hardware advances since our last test, testing was performed on the high end model of the Dell XPS 15 (9530) late 2013 edition running Windows 8.1 with all updates as of this writing.

Dell XPS 15 (9530) Late 2013 Specifications
Processor Intel Core i7-4702MQ
(Quad-core 2.2-3.2GHz, 6MB L3, 22nm, 37W)
Chipset HM87
Memory 2x8GB DDR3-1600
Graphics GeForce GT 750M 2GB GDDR5
(384 cores, 967MHz + Boost 2.0, 5GHz GDDR5)

Intel HD Graphics 4600
(20 EUs at 400-1150MHz)
Display 15.6" Glossy PPS 16:9 QHD+ (3200x1800)
(Sharp LQ156Z1 Touchscreen)
Storage 512GB mSATA SSD (Samsung SM841)
Optical Drive N/A
Networking 802.11ac WiFi (Intel Dual-Band AC-7260)
(2x2:2 867Mbps capable)
Bluetooth 4.0 (Intel)
Audio Realtek HD
Stereo Speakers
Headset jack
Battery/Power 9-cell, 11.1V, 8000mAh, 91Wh
130W Max AC Adapter
Front Side N/A
Left Side Battery Charge Indicator LEDs
Headset jack
2 x USB 3.0
1 x Mini-DisplayPort
1 x HDMI
AC Power Connection
Right Side Flash Reader (MMC/SD)
1 x USB 3.0
1 x USB 3.0 (Sleep Charging)
Kensington Lock
Back Side Exhaust vent (inside LCD hinge)
Operating System Windows 8.1 64-bit
Dimensions 14.6" x 10.0" x 0.3-0.7" (WxDxH)
(372mm x 254mm x 8-18mm)
Weight 4.44 lbs (2.01kg)
Extras 720p HD Webcam
87-Key Backlit Keyboard

The latest edition of this laptop upgrades to the "Haswell Refresh" i7-4712HQ with an extra 100 MHz clock rate compared to our test laptop. That should have little to no impact on the browser battery life testing.

Windows Timers Results and Analysis
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112 Comments

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  • Aarodynamics - Thursday, September 4, 2014 - link

    Leaving Chrome 39 x64 out of this test doesn't make a ton of sense. Chrome has made massive progress on Windows since from 36x86 to 39x64. Reply
  • marcelgs - Saturday, October 11, 2014 - link

    How on earth do you get 7.5 hrs of battery life from the XPS 15? I get around 5 hours of light use (browsing, word editing) on a fresh install of WIndows. Reply

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