Amazon high CPU consumption




18 days ago
3 days ago


(Reporter: decoder, Unassigned)




Firefox Tracking Flags

(firefox57 wontfix, firefox58 affected)





18 days ago
[Tracking Requested - why for this release]:

A friend of mine reported that his Firefox 57 on Mac OSX consumes about 80% CPU on one core when opening the following page:

I reproduced the same thing on Firefox Nightly on Linux. We tested that both Chrome and Safari consume significantly less CPU on that page so I thought it might be worthwhile to investigate this further.
See Also: → bug 1404042

Comment 1

17 days ago
Tried to reproduce this on a MBP 2015. 

I managed to capture a profile when Firefox was taking up 100% of my CPU in Nightly -- not sure it shows anything interesting.

In general, Firefox takes up about 2-3% more CPU than Chrome after the page is loaded. 

I wasn't able to find a regression window, as the increase in CPU use seems to happen inconsistently. Hope the profile helps.
Possibly related? Not sure:

Comment 3

16 days ago
Hey Christian, could you please try to reproduce again and if you can, capture a profile for us?
status-firefox57: affected → wontfix
Flags: needinfo?(choller)
Priority: -- → P2


16 days ago
See Also: → bug 1415691

Comment 4

16 days ago
possible dupe of bug 1415387.

Comment 5

3 days ago
I tried reproducing this on Fx59 and was unsuccessful. I suspect that the site changed though. I will try to confirm this with the original reporter. Nevertheless, the URL in comment 0 still seems a little slowish on Nightly. Maybe we should investigate if there is optimization potential.
Flags: needinfo?(choller)
You need to log in before you can comment on or make changes to this bug.