Animation on the website is displaying slowly and other tabs become very slow as well.




a year ago
9 months ago


(Reporter: bwu, Unassigned)


Firefox Tracking Flags

(Not tracked)


(Whiteboard: [gfx-noted])



a year ago
I use the latest nightly on my Macbook Pro (OS 10.12.3). 

1. Go to
2. Wait it to finish loading 

That tab is loading slowly. Firefox becomes very slow. Other tabs barely work. Chrome can play it well.
Hi Blake,

I tested this issue on Mac OS X 10.12 on Macbook Pro with FF Nightly 54.0a1(2017-03-05) and I can't reproduce it. In my case, the tab is loading as fast as on Safari, I can open other tabs without making Firefox slowly. 

For testing this issue, I use a new profile without add-ons. Blake please see if this is reproducible in safe mode with the latest Nightly version. Thanks
Flags: needinfo?(bwu)

Comment 2

a year ago
It is weird that I can still see this problem with safe mode. 
Can you repro this problem?
Flags: needinfo?(bwu) → needinfo?(etsai)
We seem to be overpainting here. If I turn on paint flashing in devtools, the banner is painting pretty much every frame.

This might be a graphics bug.
Yes, I'm able to reproduce this using Firefox 54 Nightly (2017-02-23 & 03-06) on Mac OS X 10.11.

Performance record shows Gecko spends half and graphics spends the other half. After load done, it works good for me.
Flags: needinfo?(etsai)


a year ago
Component: Untriaged → Graphics
Product: Firefox → Core
Whiteboard: [gfx-noted]
Priority: -- → P3
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