can someone suggest why firefox is so &$*&^%*#^&%* slow?

[Sérgio Basto]

On Sáb, 2014-09-27 at 11:01 -0400, Chuck Anderson wrote: 
> On Fri, Sep 26, 2014 at 07:36:19PM -0700, Adam Williamson wrote:
> > On Wed, 2014-09-24 at 10:44 -0400, Robert P. J. Day wrote:
> > >   i am at my wit's end with firefox on my fedora rawhide system -- to
> > > say it's nad-grindingly slow would be charitable. just now, i tried
> > > clicking on another tab ... some 30 seconds later, i am still waiting
> > > for the tab to change, oh, wait, there it is.
> > > 
> > >   watching any sort of youtube video is excruciating ... while audio
> > > is typically, i will frequently get *maybe* one frame change a second,
> > > i kid you not. i frequently get javascripts that are not responding,
> > > and i'm asked whether i want to wait for them.
> > > 
> > >   is there *something* i can do to debug this? what firefox
> > > configuration settings should i be looking at? i'm willing to try
> > > anything because, at this point, firefox is utterly unusable. even
> > > something as simple as scrolling in a window is painfully slow.
> > > 
> > >   oh, and i'm on a quad core i7, so i'm pretty sure horsepower isn't
> > > the problem.
> > 
> > FWIW, I've been seeing some odd 'laggy' behaviour in F21 on my desktop
> > lately, which does mostly seem to be in Firefox. I do have sixteen
> > zillion tabs open, but I do that a lot and it's not happened before, and
> > RAM isn't exhausted (I have 16GB, using about 8GB). I don't have Flash
> > installed. Not had time to look into it in more detail yet, but it does
> > seem like something squiffy is going on.
> > 
> > The symptoms are basically that things like switching tabs, highlighting
> > text, copy/pasting, or input appearing after I start to type lag by 1-3
> > seconds, and sometimes presses/characters that occur within the lag time
> > are lost.
> 
> I'm having problems with FF on Fedora 19 that just started recently,
> maybe related, maybe not.  In my case, the entire desktop is
> freezing--even the mouse cursor won't move for 5-10 seconds.  It
> always seems to happen when opening a new blank tab in FF.

me too , I found that flash stop working in some cases, also swfrender
from swftools and now I have to use chrome which have a bult-in flash
player 11.5.x.x, against the last Linux version 11.2.202.406 , but I
suspect that this last version 11.2.202.406  , also have some problem 

-- 
Sérgio M. B.