409345 - Images (PNG in particular) do not load / appear and performance is extremely slow

Status: RESOLVED DUPLICATE of bug 411831

(Firefox :: General, defect)

Description

[kripkenstein]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9b2) Gecko/2007121016 Firefox/3.0b2
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9b2) Gecko/2007121016 Firefox/3.0b2

PNG images don't always load (I have not noticed this with other types of images, so I suspect PNG is the issue - but I am not 100% sure). Even trying 'control-reload' to force reload from the server (and not cache) doesn't help.

In addition, pages with such images have extremely slow performance.


Reproducible: Always

Steps to Reproduce:
1. Go the the example page linked to above ( http://live.gnome.org/Gedit/LaTeXPlugin/Screenshots )
2. Notice that images do not load or do not load completely. There should be 4 large screenshots on this page.
3. IMPORTANT: If the images *do* appear to load, scroll so one is not visible, then scroll back to see it, and notice that it has now vanished.
4. Test rendering performance by resizing the image and pageup/pagedown.
Actual Results:  
Images are invisible or partially visible, and vanish if you scroll to hide them and scroll back.

Also, rendering performance in this page is very noticeably slow, as is seen when resizing the page (control-+, control--), and pageup/pagedown, etc. (However scrolling line by line is not so bad.)

Expected Results:  
The images should appear normally. This works fine in other browsers (e.g. IE 6).

Performance should be similar to FF3's performance on other pages (which is very snappy).

Comment 1

[kripkenstein]

Here is another website:

http://www.canonical.com/projects/landscape

Note how the JPG images on top are fine, but the PNG image lower down under 'software management' is missing.

Comment 2

[Grey Nicholson (they/them)]

This looks very similar to bug 411831 (although I haven't noticed the performance issues myself), so I'm marking this as a duplicate of that.

Feel free to reopen this bug (or ask someone else to if you aren't allowed) if you think they describe two separate problems.