830114 - Yahoo Mail janks

Status: RESOLVED WORKSFORME

(Core :: JavaScript Engine, defect)

Description

[Mayank Bansal]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20130113 Firefox/21.0
Build ID: 20130113031019

Steps to reproduce:

1. Create fresh profile
2. Make a Yahoo mail account. Make sure Inbox has some mails.
3. Come to this page.
3. Ctrl+click on  mail.yahoo.com
5. try to scroll in the tab while yahoo is loading in the background tab.


Actual results:

Janks. CPU usage is 100%.
Yahoo has always been quite sucky. But AFAIK, this particular bug is a recent regression. Probably less than 1 month old.

********************

http://people.mozilla.com/~bgirard/cleopatra/#report=74100f6a61e10ffdeb9b4288457d5269c363cd2f


Expected results:

Smooth loading.

Comment 1

[(dormant account)]

Is this still bad when you set firefox cache size to 0( via advanced/network settings)?

Comment 2

[Mayank Bansal]

It janks lesser, but still noticable.

Comment 3

[Mayank Bansal]

FWIW, the SPS profiler doesnt record the profile for more than 3-4 seconds on yahoo mail. Even if the profiler runs for ~12-13 seconds, the profile shows a time of only ~3.4 seconds.
Is this a bug ?

Comment 4

[Mayank Bansal]

This has worsened in the past few days. Its so bad now that i cringe when i see a new mail notification, and have to open ymail.
And i use a SSD.

Comment 5

[(mostly gone) XtC4UaLL [:xtc4uall]]

Confirmed the Jank against Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20130320 Firefox/22.0 ID:20130320031103 CSet: 8156df33b757, no 100% CPU Usage on my End though.

fresh SPS: http://people.mozilla.com/~bgirard/cleopatra/#report=09cc1e866f7de4f7459e917ea5dcaf974518933c

Comment 6

[Mayank Bansal]

fine enough now.