279501 - Transparent background slows browser

Status: RESOLVED EXPIRED

(Core :: Graphics: ImageLib, defect)

Description

[Joël Kuiper]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b) Gecko/20050122 Firefox/1.0+
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b) Gecko/20050122 Firefox/1.0+

Using a transparent gif or png as background (specified in the CSS) on any
element. Slows the painting and overall performance of the browser.
I've seen this happen on http://firedonkey.uruviel.com and
http://www.uruviel.com/test . And numerous other sites that rely on transparency.
(note: the preformance of IE or Opera is not affected by this)

Reproducible: Always

Steps to Reproduce:
1. open a site with a transparent background
2.

Actual Results:  
Slow performance

Expected Results:  
Normal performance

Comment 1

[Joël Kuiper]

Sorry firedonkey.uruviel.com seems not affected (anymore) by this problem.

Comment 2

[Mats Palmgren (inactive)]

Is this bug different from the bug 279250 you reported in any way?

Comment 3

[Goi]

The sites that you provided seem to work fine, and I haven't encountered any
problem with PNG images, but I have experience massive slowdowns with
transparent GIFs, whether they are simply used as images or background images. I
have posted a bugzilla entry 293222 for this problem.

Comment 4

[Gervase Markham [:gerv]]

This is an automated message, with ID "auto-resolve01".

This bug has had no comments for a long time. Statistically, we have found that
bug reports that have not been confirmed by a second user after three months are
highly unlikely to be the source of a fix to the code.

While your input is very important to us, our resources are limited and so we
are asking for your help in focussing our efforts. If you can still reproduce
this problem in the latest version of the product (see below for how to obtain a
copy) or, for feature requests, if it's not present in the latest version and
you still believe we should implement it, please visit the URL of this bug
(given at the top of this mail) and add a comment to that effect, giving more
reproduction information if you have it.

If it is not a problem any longer, you need take no action. If this bug is not
changed in any way in the next two weeks, it will be automatically resolved.
Thank you for your help in this matter.

The latest beta releases can be obtained from:
Firefox:     http://www.mozilla.org/projects/firefox/
Thunderbird: http://www.mozilla.org/products/thunderbird/releases/1.5beta1.html
Seamonkey:   http://www.mozilla.org/projects/seamonkey/

Comment 5

[Gervase Markham [:gerv]]

This bug has been automatically resolved after a period of inactivity (see above
comment). If anyone thinks this is incorrect, they should feel free to reopen it.