793359 - jank when opening a google groups page

Status: RESOLVED WORKSFORME

(Core :: JavaScript Engine, defect)

Description

[timbugzilla]

Attachment: about:support as text file

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

A gecko profiler profile for this is available here:

http://people.mozilla.com/~bgirard/cleopatra/?report=bd345397daed044bf60792452d9c80edb9d4a235

My about:support has been attached as a text file.

Comment 1

[Manoj]

I notice this on x64 Windows 7 on all Google Blogspot blogs that use widgets and default themes.

Comment 2

[timbugzilla]

Here's a profile for opening the "my groups" page at google groups.

http://people.mozilla.com/~bgirard/cleopatra/#report=d0d1a2602885fe296ab0d64c6c4be88e27415b2c

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.

https://groups.google.com/forum/#!myforums

Comment 3

[Mayank Bansal]

even opening the gmail page for the first time causes ~1-1.5 seconds jank.
Profile :
http://people.mozilla.com/~bgirard/cleopatra/#report=aad761f1529578c57c9fee68ce3ceb8b60288de3

IIRC this is already being tracked in another bug. Should be P1, IMO.

Comment 4

[Mayank Bansal]

see also : bug 789598

Comment 5

[timbugzilla]

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 moz.dev.platform group:

https://groups.google.com/forum/#!forum/mozilla.dev.platform

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

https://groups.google.com/forum/#!topic/mozilla.dev.platform/fEUHUse_qb8

Then press the "u" key to return to the moz.dev.platform 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:

http://people.mozilla.com/~bgirard/cleopatra/#report=a919bc7a8903d32c10c294240efef8f700e9cd9f

Most of the jank time seems to be spent in the JS interpreter.

Comment 6

[timbugzilla]

That profile was recorded on an Intel E8500 based machine running todays moz central nightly win32 build, on win7 x64.

Comment 7

[Mayank Bansal]

http://people.mozilla.com/~bgirard/cleopatra/#report=c5caf961350d8ccb46dcd8825fc8bc741f023f85

In google groups, switching from "compact list view" to "standard view".

Comment 8

[Wayne Mery (:wsmwk)]

Can you still reproduce?

https://groups.google.com/forum/#!topic/mozilla.dev.platform/fEUHUse_qb8 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

[Mayank Bansal]

with e10s and APZC, this is fine now.

Comment 10

[timbugzilla]

Looks like there is still a little bit of jank (like less than 500 ms), but it is much better.

Comment 11

[Wayne Mery (:wsmwk)]

Thanks for the update