1412535 - High CPU on uk.reuters.com even after Bug 1409166 fixed

Status: UNCONFIRMED

(Core :: General, defect)

Description

[Mark]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:58.0) Gecko/20100101 Firefox/58.0
Build ID: 20171027220059

Steps to reproduce:

Navigate to http://uk.reuters.com/ on MacOS 10.13 & Nightly 58.0a1 2017-10-17.

Nightly -> ~18% CPU       for the NightlyCP Web Content process (after Bug 1409166 fixed)
Firefox 56 -> ~50% CPU   for the Web Content (presumably because 1409166  not fixed)

Disabling Servo makes no difference.

There may be nothing you can do, Chrome struggles as well with ~13% CPU. Safari handles it well at ~1% CPU

I can't see any visible animations or whatever but there may be a good reason for the CPU load, it's not awful just higher than I would expect. Cheers


Actual results:

High CPU


Expected results:

Low CPU

Comment 1

[Hiroyuki Ikezoe (:hiro)]

I don't think this is regressed by bug 1409166. Also it's not clear to me that it's related to animations, there might be other room for improvement though.

Comment 2

[Hiroyuki Ikezoe (:hiro)]

I did get a profile.
https://perfht.ml/2gLBpOl

There is nothing particular for animations.

Comment 3

[Brian Birtles (:birtles, Feb 26~ parental leave)]

Changing component based on comment 2.

Comment 4

[John Garcia]

Attachment: same problem

Thanks from riatocheles1989.