Eddie, please install Firebug 1.4X.2, open the tracing window with
ERRORS set, and repeat the test, post the trace on our bug report
list.
More info: http://groups.google.com/group/firebug/web/faq-about-firebug.
I'll post back here with the results.
(The line number in 1.4.2 are different from 1.4X)
jjb

On Aug 5, 10:32 am, Ed Abrams <[email protected]> wrote:
> Hello,
>
> Here is my platform: Mac OSX Leopard (10.5.7).
>
> Here is my browser: Firefox 3.5.2 (Build identifier: Mozilla/5.0
> (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1.2) Gecko/20090729
> Firefox/3.5.2)
>
> Here is my Firebug: 1.4.2
>
> Problem: Crazy-bad performance in any window under test case
>
> Test case:
>  * open firefox 3.5 and several tabs
>  * in one tab, go to gmail.com
>  * disable firebug
>  * go to gmail.com
>  * verify that performance in all cases is normal
>  * enable firebug
>  * enable every firebug panel EXCEPT console (disabled)
>  * verify that performance in all cases is normal
>  * enable the CONSOLE
>  * in gmail, click 'compose message'
>  * start typing
>
> PROBLEM: the performance has become so bad that the characters you're
> typing only appear at a rate of 1 character per second.  Every other
> tab and window is also performance-hit.  If you try, you can get the
> 'stop script' dialog to appear, which cites a Firebug script, lib.js,
> at line 1176 (I think -- I should double check) as being the lagging
> line.
>
> I hope this helps.
>
> -Eddie
>
> On Aug 4, 3:21 pm, Prefontim <[email protected]> wrote:
>
> > I am also getting extremely slow performance with Firebug 1.4.x on FF
> > 3.0.  Firebug 1.3.3 did not have this issue.  I disabled all other
> > plug-ins, but that did not help.  Then, I tested it on a new profile,
> > and that did not help either.  Firebug is too slow to be usable at
> > this point.  I will have to use 1.3.3 (which is also almost too buggy
> > to be usable) for now.
>
> > On Aug 4, 10:38 am, ak732 <[email protected]> wrote:
>
> > > @SteveG:
>
> > > I am seeing pretty good performance across all tabs at this point.  I
> > > can pretty much just leave firebug on all the time now w/out seeing
> > > any undue performance hit.  At least on any sites I've visited
> > > recently.
>
> > > Note that the ipv6 fix had nothing to do with Firebug itself.  It was
> > > purely a WinVista/Firefox performance issue.  I only thought it was
> > > Firebug originally because it occurred coincidentally w/my creating a
> > > new Firefox profile to try out the newer version of Firebug (and the
> > > newer profiles are created w/ipv6 enabled by default, unlike the older
> > > ones).
>
> > > On Jul 27, 2:12 am, SteveG <[email protected]> wrote:
>
> > > > I tried setting the network.dsn.disableIPv6 to true...  but the DOM
> > > > inspector was still preforming veryslow?
> > > > Are there any other workarounds that you know of?
>
> > > > On Jul 21, 3:06 pm, ak732 <[email protected]> wrote:
>
> > > > > After a bunch of digging, I found a Firefox performance tweak that
> > > > > fixed the problem.  Hopefully this will help some others.  In summary,
> > > > > I changed network.dsn.disableIPv6 from true to false.
>
> > > > > 1.      Open Firefox 3.x.
> > > > > 2.      Type “about:config” in the address bar and hit enter.
> > > > > 3.      In the Filter bar, enter “network.dns”.
> > > > > 4.      You should see a setting called “network.dsn.disableIPv6”.  
> > > > > It’s
> > > > > likely set to “false”.
> > > > > 5.      Double-click the setting “network.dsn.disableIPv6” which 
> > > > > changes it
> > > > > to true.
> > > > > 6.      Close your browser.
> > > > > 7.      Reload the browser.
> > > > > 8.      Run the app and it should be considerably faster.
>
> > > > > This improved load times for our, admittedly resource-heavy, web
> > > > > application by around a factor or 10.  I suspect it might be a fix
> > > > > that only matters on Windows Vista, maybe Win7.  Anyway, it's easy
> > > > > enough to try.
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