1425447 - FPS drop on webpage with large gif

Status: RESOLVED WORKSFORME

(Core :: Graphics: WebRender, defect)

Description

[houghstler]

Attachment: performanceIssue.png

User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:59.0) Gecko/20100101 Firefox/59.0
Build ID: 20171215100105

Steps to reproduce:

On Nightly: 59.0a1 build 12-15 (64 bit) with all addons turned off

Go to: https://us.norton.com/core
Scroll down the entire page to load all the elements.
Go back to top and start scrolling down the page with arrow keys



Actual results:

You should notice an FPS drop when near the animated gif (about center of page)
Once you scroll past, you should see FPS return to normal levels


Expected results:

I would have expected the FPS to stay around the same rate with a gif on the screen.

Comment 1

[Milan Sreckovic [:milan] (needinfo for best results)]

I expect we're just busy decoding, but maybe some of Andrew's patches would deal with this.

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:gw, could you have a look please?

For more information, please visit BugBot documentation.

Comment 3

[Mayank Bansal]

I could not repro the FPS frop : https://share.firefox.dev/3yP46Wc

Greg, could you repro? If not, this bug may be closed.

Comment 4

[Gregory Pappas [:gregp]]

Not able to reproduce.