Last Comment Bug 793359 - jank when opening a google groups page
: jank when opening a google groups page
: perf
Product: Core
Classification: Components
Component: JavaScript Engine (show other bugs)
: Trunk
: x86 Windows 8
-- normal (vote)
: ---
Assigned To: Nobody; OK to take it and work on it
: Jason Orendorff [:jorendorff]
Depends on:
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Reported: 2012-09-21 20:09 PDT by timbugzilla
Modified: 2016-03-07 06:55 PST (History)
7 users (show)
See Also:
Crash Signature:
QA Whiteboard:
Iteration: ---
Points: ---
Has Regression Range: ---
Has STR: ---

about:support as text file (4.88 KB, text/plain)
2012-09-21 20:09 PDT, timbugzilla
no flags Details

Description User image timbugzilla 2012-09-21 20:09:27 PDT
Created attachment 663634 [details]
about:support as text file

I experience a few seconds of jank when opening a google groups' group page such as

A gecko profiler profile for this is available here:

My about:support has been attached as a text file.
Comment 1 User image Manoj 2012-09-26 07:02:04 PDT
I notice this on x64 Windows 7 on all Google Blogspot blogs that use widgets and default themes.
Comment 2 User image timbugzilla 2013-02-07 00:26:32 PST
Here's a profile for opening the "my groups" page at google groups.

Most of the jank period seems to be spent in an Evaluate String operation.

Profile was recorded on an Intel E8500 based machine with win7 x64. 06/02 moz-central nightly win32 build.!myforums
Comment 3 User image mayankleoboy1 2013-02-07 01:02:56 PST
even opening the gmail page for the first time causes ~1-1.5 seconds jank.
Profile :

IIRC this is already being tracked in another bug. Should be P1, IMO.
Comment 4 User image mayankleoboy1 2013-02-07 01:10:56 PST
see also : bug 789598
Comment 5 User image timbugzilla 2013-02-07 18:22:31 PST
There is also quite a bit of jank when using the "u" keyboard shortcut to return to group page from a thread page. e.g. Go to the group:!forum/

Then enter the thread for "How does one debug uninitialized value usage from JavaScript (TB) ?".!topic/

Then press the "u" key to return to the group.

I do not see this when using the same keyboard shortcut to return to my inbox in gmail for example. The operation also completes a lot more quickly in Chrome.

The profile is here:

Most of the jank time seems to be spent in the JS interpreter.
Comment 6 User image timbugzilla 2013-02-07 18:24:15 PST
That profile was recorded on an Intel E8500 based machine running todays moz central nightly win32 build, on win7 x64.
Comment 7 User image mayankleoboy1 2013-02-08 21:08:50 PST

In google groups, switching from "compact list view" to "standard view".
Comment 8 User image Wayne Mery (:wsmwk, NI for questions) 2015-07-05 16:51:10 PDT
Can you still reproduce?!topic/ takes a long time to load. But I do not experience jank. This is with a current nightly and e10s enabled, heavily loaded with 400 tabs

I also cannot reproduce related bug 924001, nor bug 802731
Comment 9 User image mayankleoboy1 2015-07-06 00:31:58 PDT
with e10s and APZC, this is fine now.
Comment 10 User image timbugzilla 2015-07-10 03:51:39 PDT
Looks like there is still a little bit of jank (like less than 500 ms), but it is much better.
Comment 11 User image Wayne Mery (:wsmwk, NI for questions) 2016-03-07 06:55:49 PST
Thanks for the update

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