713220 - Page scrolling lag on heavy js site

Status: UNCONFIRMED

(Firefox :: General, defect)

Description

[Wong Huong Cheong]

User Agent: Mozilla/5.0 (Windows NT 6.1; rv:9.0.1) Gecko/20100101 Firefox/9.0.1
Build ID: 20111220165912

Steps to reproduce:

Open facebook.com


Actual results:

Scrolling very lag on the facebook.com


Expected results:

Scrolling smoothly.

Comment 1

[Matthias Versen [:Matti]]

Do you have the new timeline interface activated in facebook ?
This is probably a dupe of bug 712883

Comment 2

[Wong Huong Cheong]

i didn't enable timeline for my profile.
It happen in news feed page.

besides that, while playing flash movie in facebook or any website contains flash movie, flash movie is lag is compare to google chrome.

I think it is something related to javascript.

p/s: while happening any lag i found that cpu usage very high

Comment 3

[Mats Palmgren (inactive)]

Does the problem also occur in a Nightly build?
http://nightly.mozilla.org/

Comment 4

[Wong Huong Cheong]

I changes the summary..
Because I found that firefox facing scrolling lag in Gmail, Google Reader as well

Comment 5

[Wong Huong Cheong]

I tried with nightly version (12a1), no much different.
lag on scrolling and lag while playing flash movie as well

Comment 6

[Alex]

See Bug 712883

Comment 7

[Jerry Ransom]

I confirm. It is not only facebook problem. Firefox had the awesome scroll on Google Reader until google changed it's design. Now it's fully impossible to work with GReader with FX (I had to use external RSS reader).

Comment 8

[Jerry Ransom]

Checked on Nightly UX 12.0a1. The same problem. Changing smooth scroll doesn't help.

Comment 9

[Jerry Ransom]

Please confirm bug.

Comment 10

[Jerry Ransom]

Enable Smooth Scrolling in GReader Settings (Experiments tab) doesn't work.

Comment 11

[Jerry Ransom]

Nothing changed in 13.0a1. Please let me uninstall Chrome!!!

Comment 12

[Jerry Ransom]

Yet Another Smooth Scrolling extension solve problem, but
this: https://www.google.com/support/forum/p/Chrome/thread?tid=7f68043bcf0e8ad2&hl=en
is history already.

Comment 13

[mihal.v]

I agree. No changes even in version 21 :(
This bug blocks this: "Become a market leader in performance" (https://wiki.mozilla.org/Platform/2013-Goals)

Please confirm this bug and make smth.

P.S. Try GReader with Chromium if you think it's OK with FX.

Comment 14

[Andrew McCreight [:mccr8]]

Getting a profile using the builtin profiler in 21 might help diagnose this problem:
https://developer.mozilla.org/en/Performance/Profiling_with_the_Built-in_Profiler

Comment 15

[mihal.v]

Attachment: profile from Gecko Profiler

Comment 16

[mihal.v]

my profile in attach (if it can help).

I have: Firefox UX latest build, Windows 7 x86

Steps used to create profile:
1. start UX, login to GReader
2. Scroll 100 unread items

All add-ons and plugins were disabled (except Gecko Profiler 1.11.19, Flash 11.6.602.108 and Silverlight 5.1.10411.0)

3. Press 'Analyze'
4. Save profile to local file.

Comment 17

[Josh Matthews [:jdm]]

Thanks for the profile, mihal. For future reference, it's usually more convenient to analyze if you upload the profile and dump the link in the bug instead.