firefox, scaled images, and performance?

[Tom Horsley]

Has anyone else noticed a distinct tendency in firefox to
get hopelessly bogged down and unresponsive when it is
displaying a vary large image it has scaled to fit on the
screen, and then to become perfectly responsive once you
click on the image to display it full size?

For example:

http://www.widescreenwallpapers.in/bulkupload/widescreen/HD/Arctic%20sunr...

If I try to do a "save image as" and navigate around the
file browser to save the image in a directory it takes
a little time to navigate to, the browser gets all hung
up.

If I first click on the image to make it full size, I have
no problem navigating anywhere.

What the heck is firefox doing? Am I the only one who
sees it?

[Chris Tyler]

On Tue, 2010-12-28 at 10:43 +0530, Jatin K wrote:
>  > What the heck is firefox doing? Am I the only one who
>  > sees it?
>  Same here ..... don't know why ????!!!!! magic 
Since some people are seeing this and some are not, could it be a
particular extension that you have installed? What happens if you
disable all of your extensions (or create a new profile by running
"firefox -profilemanager" and using the Profile dialog that appears?)

-Chris

[Jatin K]

On Monday 27 December 2010 10:50 PM, Tom Horsley wrote:
>  Has anyone else noticed a distinct tendency in firefox to
>  get hopelessly bogged down and unresponsive when it is
>  displaying a vary large image it has scaled to fit on the
>  screen, and then to become perfectly responsive once you
>  click on the image to display it full size?
>
>  For example:
>
>  http://www.widescreenwallpapers.in/bulkupload/widescreen/HD/Arctic%20sunr...
>
>  If I try to do a "save image as" and navigate around the
>  file browser to save the image in a directory it takes
>  a little time to navigate to, the browser gets all hung
>  up.
>
>  If I first click on the image to make it full size, I have
>  no problem navigating anywhere.
>  
>  What the heck is firefox doing? Am I the only one who
>  sees it? 
Same here ..... don't know why ????!!!!! magic

but not in chrome

-- 
   °v°
  /(_)\
   ^ ^  Jatin Khatri
Registerd Linux user No #501175
www.counter.li.org
No M$

[Suvayu Ali]

On Monday 27 December 2010 02:18 PM, john wendel wrote:
>  On 12/27/2010 01:59 PM, Konstantin Svist wrote:
> > On 12/27/2010 01:32 PM, Tom Horsley wrote:
> >> On Mon, 27 Dec 2010 13:13:24 -0800
> >> Konstantin Svist wrote:
> >>
> >>> You're not crazy, you just didn't describe how to reproduce the
> problem.
> >>> Using above example, open the Save Image dialog but don't bother
> >>> browsing. Instead, just drag it around the screen in front of the image
> >>> -- it's VERY slow compared to unscaled.
> >> Yea, I discovered later that was a good way to notice problems
> >> as well. It is kind of hard to guess exactly which things are
> >> going to be slow. I wonder if this is another manifestation of
> >> the cairo bug (628331). I'll have to try downloading the mozilla
> >> binaries and see if I see the same slowdown.
> >
> > Most likely Firefox doesn't cache the scaled image -- so when you move a
> > window on top of the image and Fx has to redraw, it has to scale it all
> > the way down, first.
> >
>
>  Sorry, if I'm confused, but I haven't followed this thread closely ...
>
>  I'm using Firefox 4 Beta 8 on F13 32-bit and I don't have any problems
>  with huge scaled images. Single core P4 (not so fast).
>  
I am on FF 3.6.13 and I don't have the above mentioned problem. But FF 
does get sluggish with images when it has been running for a long time 
(a week maybe).

-- 
Suvayu

Open source is the future. It sets us free.

[Konstantin Svist]

On 12/27/2010 02:18 PM, john wendel wrote:
>  On 12/27/2010 01:59 PM, Konstantin Svist wrote:
> > On 12/27/2010 01:32 PM, Tom Horsley wrote:
> >> On Mon, 27 Dec 2010 13:13:24 -0800
> >> Konstantin Svist wrote:
> >>
> >>> You're not crazy, you just didn't describe how to reproduce the
> problem.
> >>> Using above example, open the Save Image dialog but don't bother
> >>> browsing. Instead, just drag it around the screen in front of the image
> >>> -- it's VERY slow compared to unscaled.
> >> Yea, I discovered later that was a good way to notice problems
> >> as well. It is kind of hard to guess exactly which things are
> >> going to be slow. I wonder if this is another manifestation of
> >> the cairo bug (628331). I'll have to try downloading the mozilla
> >> binaries and see if I see the same slowdown.
> > Most likely Firefox doesn't cache the scaled image -- so when you move a
> > window on top of the image and Fx has to redraw, it has to scale it all
> > the way down, first.
> >
>  Sorry, if I'm confused, but I haven't followed this thread closely ...
>
>  I'm using Firefox 4 Beta 8 on F13 32-bit and I don't have any problems
>  with huge scaled images. Single core P4 (not so fast).
>
>  Regards,
>
>  John
>  
You're right, looks like it's fixed in v4

[Fred Smith]

On Mon, Dec 27, 2010 at 04:01:52PM -0500, Tom Horsley wrote:
>  On Mon, 27 Dec 2010 15:49:49 -0500
>  Tom Horsley wrote:
>  
>  > I guess I'll try making
>  > a completely new user and see if the new user has the same
>  > problem.
>  
>  Nope. I see it with a brand new, never before created user
>  as well. I get the impression that it doesn't cache anything
>  about the scaled image and has to recompute the whole thing
>  from scratch to do any kind of screen refresh. Dragging the
>  Save As dialog across the scaled image goes really jerky
>  and leaves trails that aren't refreshed for a long time.
>  Maybe I'll just search for a "don't scale by default"
>  about:config setting and turn that on... 
that's in VIEW | ZOOM | ZOOM TEXTG ONLY. you don't need to dig
around in about:config, just go there and check the checkbox.


-- 
---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us -----------------------------
                       I can do all things through Christ 
                              who strengthens me.
------------------------------ Philippians 4:13 -------------------------------

[John Wendel]

On 12/27/2010 01:59 PM, Konstantin Svist wrote:
>  On 12/27/2010 01:32 PM, Tom Horsley wrote:
> > On Mon, 27 Dec 2010 13:13:24 -0800
> > Konstantin Svist wrote:
> >
> >> You're not crazy, you just didn't describe how to reproduce the problem.
> >> Using above example, open the Save Image dialog but don't bother
> >> browsing. Instead, just drag it around the screen in front of the image
> >> -- it's VERY slow compared to unscaled.
> > Yea, I discovered later that was a good way to notice problems
> > as well. It is kind of hard to guess exactly which things are
> > going to be slow. I wonder if this is another manifestation of
> > the cairo bug (628331). I'll have to try downloading the mozilla
> > binaries and see if I see the same slowdown.
>
>  Most likely Firefox doesn't cache the scaled image -- so when you move a
>  window on top of the image and Fx has to redraw, it has to scale it all
>  the way down, first.
>  
Sorry, if I'm confused, but I haven't followed this thread closely ...

I'm using Firefox 4 Beta 8 on F13 32-bit and I don't have any problems 
with huge scaled images. Single core P4 (not so fast).

Regards,

John

[Konstantin Svist]

On 12/27/2010 01:32 PM, Tom Horsley wrote:
>  On Mon, 27 Dec 2010 13:13:24 -0800
>  Konstantin Svist wrote:
>
> > You're not crazy, you just didn't describe how to reproduce the problem.
> > Using above example, open the Save Image dialog but don't bother
> > browsing. Instead, just drag it around the screen in front of the image
> > -- it's VERY slow compared to unscaled.
>  Yea, I discovered later that was a good way to notice problems
>  as well. It is kind of hard to guess exactly which things are
>  going to be slow. I wonder if this is another manifestation of
>  the cairo bug (628331). I'll have to try downloading the mozilla
>  binaries and see if I see the same slowdown. 
Most likely Firefox doesn't cache the scaled image -- so when you move a 
window on top of the image and Fx has to redraw, it has to scale it all 
the way down, first.

[Tom Horsley]

On Mon, 27 Dec 2010 16:32:50 -0500
Tom Horsley wrote:

>  I wonder if this is another manifestation of
>  the cairo bug (628331). I'll have to try downloading the mozilla
>  binaries and see if I see the same slowdown. 
Nope. The mozilla binary has the same problem, so for once
this is not a cairo interface change problem.

[Tom Horsley]

On Mon, 27 Dec 2010 13:13:24 -0800
Konstantin Svist wrote:

>  You're not crazy, you just didn't describe how to reproduce
> the problem.
>  Using above example, open the Save Image dialog but don't bother 
>  browsing. Instead, just drag it around the screen in front of the image 
>  -- it's VERY slow compared to unscaled. 
Yea, I discovered later that was a good way to notice problems
as well. It is kind of hard to guess exactly which things are
going to be slow. I wonder if this is another manifestation of
the cairo bug (628331). I'll have to try downloading the mozilla
binaries and see if I see the same slowdown.

[Konstantin Svist]

On 12/27/2010 09:20 AM, Tom Horsley wrote:
>  Has anyone else noticed a distinct tendency in firefox to
>  get hopelessly bogged down and unresponsive when it is
>  displaying a vary large image it has scaled to fit on the
>  screen, and then to become perfectly responsive once you
>  click on the image to display it full size?
>
>  For example:
>
>  http://www.widescreenwallpapers.in/bulkupload/widescreen/HD/Arctic%20sunr...
>
>  If I try to do a "save image as" and navigate around the
>  file browser to save the image in a directory it takes
>  a little time to navigate to, the browser gets all hung
>  up.
>
>  If I first click on the image to make it full size, I have
>  no problem navigating anywhere.
>
>  What the heck is firefox doing? Am I the only one who
>  sees it? 
You're not crazy, you just didn't describe how to reproduce the problem.
Using above example, open the Save Image dialog but don't bother 
browsing. Instead, just drag it around the screen in front of the image 
-- it's VERY slow compared to unscaled.

Or maybe I'm seeing a slightly different problem. But then I'm using an 
SSD so if browsing files slows down 2x I wouldn't even notice...

[Tom Horsley]

On Mon, 27 Dec 2010 15:49:49 -0500
Tom Horsley wrote:

>  I guess I'll try making
>  a completely new user and see if the new user has the same
>  problem. 
Nope. I see it with a brand new, never before created user
as well. I get the impression that it doesn't cache anything
about the scaled image and has to recompute the whole thing
from scratch to do any kind of screen refresh. Dragging the
Save As dialog across the scaled image goes really jerky
and leaves trails that aren't refreshed for a long time.
Maybe I'll just search for a "don't scale by default"
about:config setting and turn that on...

[Tom Horsley]

On Mon, 27 Dec 2010 13:39:03 -0500
Chris Tyler wrote:

>  I tried this here and see about the same responsiveness whether
> scaled
>  or full-size.
>  
>  Which fedora release, firefox version, and arch are you using? 
I'm on fedora 14 firefox-3.6.13-1.fc14.x86_64. I just tried it
with the -safe-mode option and I still see the delays. It is
definitely weird. Thanks for the info. I guess I'll try making
a completely new user and see if the new user has the same
problem.

[David]

On 12/27/2010 12:20 PM, Tom Horsley wrote:
>  Has anyone else noticed a distinct tendency in firefox to
>  get hopelessly bogged down and unresponsive when it is
>  displaying a vary large image it has scaled to fit on the
>  screen, and then to become perfectly responsive once you
>  click on the image to display it full size?
>  
>  For example:
>  
>  http://www.widescreenwallpapers.in/bulkupload/widescreen/HD/Arctic%20sunr...
>  
>  If I try to do a "save image as" and navigate around the
>  file browser to save the image in a directory it takes
>  a little time to navigate to, the browser gets all hung
>  up.
>  
>  If I first click on the image to make it full size, I have
>  no problem navigating anywhere.
>  
>  What the heck is firefox doing? Am I the only one who
>  sees it? 

I can not produce any of these problems.

-- 


  David

[Chris Tyler]

On Mon, 2010-12-27 at 12:20 -0500, Tom Horsley wrote:
>  For example:
>  
>  http://www.widescreenwallpapers.in/bulkupload/widescreen/HD/Arctic%20sunr...
>  
>  If I try to do a "save image as" and navigate around the
>  file browser to save the image in a directory it takes
>  a little time to navigate to, the browser gets all hung
>  up.
>  
>  If I first click on the image to make it full size, I have
>  no problem navigating anywhere.
>  
>  What the heck is firefox doing? Am I the only one who
>  sees it? 
I tried this here and see about the same responsiveness whether scaled
or full-size.

Which fedora release, firefox version, and arch are you using?

-Chris