poor battery life with google chrome

[kai zhu]

on my macbook 12", i've (albeit subjectively) noticed somewhat recently, my battery drains faster while watching youtube videos on chrome.

here's some energy-impact numbers i recorded for chrome, firefox, and safari for the sites: example.com, youtube.com, facebook.com.  note i don't use firefox much, but switching to safari to watch youtube seems to improve my battery life

chrome - Version 65.0.3325.181 (Official Build) (64-bit)

firefox - 59.0.2 (64-bit)

safari - Version 11.0.2 (12604.4.7.1.4)

rough energy-impact numbers from activity-monitor on 2017 macbook 12" after waiting ~1 minute for webpage loading/init to settle down:

example.com:

google chrome - 4.3

firefox               - 0.6

safari                - 0.0

youtube.com:

google chrome - 79.5

firefox               - 57

safari                - 15.0

facebook.com:

google chrome - 4.1

firefox               - 4.2

safari                - 1.3

-kai

[Dan Sanders]

Assuming that you are watching HD content, this is consistent with the difference between software and hardware decoding.

I believe that the 2017 12" MacBook has a Kaby Lake CPU, and therefore supports hardware accelerated decode of VP9. This capability is not exposed by the OS APIs, however. It might be helpful to file a RADAR ticket requesting that hardware accelerated VP9 be exposed to apps.

A difference vs. Firefox is harder to explain, since Chrome and Firefox expose roughly similar media capabilities. We're not currently tracking Firefox power usage in our media power analysis pipeline, but we should be. I'll file a bug to start doing that, and to investigate further if a difference turns up in our lab.

- Dan

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[kai zhu]

i see, thx for troubleshooting.  i’ve filed a bug on apple’s radar asking for hardware vp9 support for browsers.

[Dale Curtis]

Hi Kai, if possible can you also fill out a http://www.openradar.me/ with the details of the bug you filed on Apple's internal radar? That way it's possible for others to follow along since the internal radar is closed to the public. You have no obligation to do this, but thanks if you decide to!

- dale

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[kai zhu]

k, refiled internal radar on openradar @ http://www.openradar.me/39617309

kai zhu

kaiz...@gmail.com

[Dale Curtis]

Thanks!

- dale