Flash plugin [almost] hangs browser




17 years ago
16 years ago


(Reporter: calum.mackay, Assigned: srgchrpv)



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(1 attachment)



17 years ago
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; SunOS sun4u; en-US; rv:0.9.4+) Gecko/20010926
BuildID:    2001092610

Recently [for the lack few weeks of nightly builds], if I visit a site
that uses the Flash plugin, mozilla slows to a *crawl* and just about
hangs up completely.

Two sites that demonstrate this for me are:


I'm using the current 5.0r52 Flash player.

One might think this a problem with the player, except:

o It worked fine a few weeks ago

o It works fine in 4.x

I am seeing an error loading the player class file; see bug 101871,
which also started a few weeks ago, but this may be coincidence.

The player does appear to work (animations appear etc), but the browser
becomes unusable within minutes.

Reproducible: Always
Steps to Reproduce:
1.visit one of the listed sites
2.try and continue using the browser (within the sites).

Comment 1

17 years ago
works fine on W2K 2001092503  - Shockwave Flash 5.0 r41

Comment 2

17 years ago
I note that when the page first comes up, all is well. As soon as the animations
get loaded, mozilla's cpu usage goes to 100%, and it becomes almost unusable.

Clicking on anything takes minutes to react, and after that it more or less
just hangs up completely.

I realise we're a bit short of detail here, but not sure what more I can

Comment 3

17 years ago
Can't reproduce problem on Solaris with Mozilla 0.9.4 build 2001092610
by going to either site. My browser is perfectly responsive.

Comment 4

17 years ago
I lied,

Seems you jave to leave your browser on that page for a minute or  two.
Couldn't reproduce with http://www.play247.com, but can with 
http://www.lcegroup.co.uk which takes you to


Mozilla starts gobbling up all CPU time.

Comment 5

17 years ago
It takes a few minutes to load the animations from the play247 site; whilst
they're loading all is fine, but once they start to play, that's when it goes

Reproducible everytime for me.

Comment 6

17 years ago
I can confirm this.  I'm using Mozilla nightly 2001101210 on a sparc ultra 5
running solaris 8, with flash plugin "Shockwave Flash 5.0 r52".

Went to www.play.com (play247.com just redirects to play.com). The page contains
four separate SWF objects, each of which plays continuously. Once the flash
animations begin, mozilla becomes unresponsive.  The animations play at what
appears to be normal speed, but mozilla doesn't respond to button clicks or X
windows events. E.g. if a mozilla window is minimized and restored, mozilla
won't repaint it.

Basically, it appears that mozilla is giving all of its processing time to
Flash, leaving nothing for mozilla itself.

I reduced www.play.com to a testcase containing only the OBJECT tags for the
four flash animations, and then tried loading the page with some of the objects
commented out.  On my host, moz behaves well with one object active, becomes
sluggish with two, and very sluggish to nonresponsive with three or more. A more
powerful computer might do better.
Ever confirmed: true

Comment 7

17 years ago
Created attachment 53384 [details]
www.play.com flash objects

Comment 8

17 years ago
same problem as in bug 99361

Comment 9

17 years ago
I'm seeing this with linux, mozilla 0.9.7 and the flash 5.0r47 plugin too.
This may or may not be related to other problems I'm having with the plugin; it
hangs mozilla on other flash-using sites too (like http://www.flash.com).
In the case of the lcegroup.co.uk mozilla starts to eat as much cpu as it can;
the other site works just fine.

Maybe platform/os should be changed to all/all ?

Comment 10

17 years ago
I'm seeing the same problem with Mozilla 0.9.7, flash 5.0r47.

Comment 11

17 years ago
--- Mass reassigning Unix bugs to serge ---
Assignee: av → serge

Comment 12

17 years ago
I have no idea what we can do in mozilla code to improve flash performance ;)
the simple comparison of cpu% for flash 5.0 r47  plugin  in netscape 4.78 and
mozilla 2002-02-02 gives me roughly the same % on test case attachment 53384 [details] or
7up.com, of course % depends on speed of cpu
I'm going to close this as WONTFIX


Comment 13

17 years ago

*** This bug has been marked as a duplicate of 99361 ***
Last Resolved: 17 years ago
Resolution: --- → DUPLICATE

Comment 14

16 years ago
mass duplicate verifications . For filtering purposes, pls use keywd

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