Very bad/slow rendering / performance on referenced page.




15 years ago
14 years ago


(Reporter: Ian Graham, Unassigned)



Windows 2000

Firefox Tracking Flags

(Not tracked)



(1 attachment, 1 obsolete attachment)



15 years ago
User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.3) Gecko/20030312
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.3) Gecko/20030312

The browser slows to a crawl when rendering this page, including page resizing,
etc. The page is (physically) small, and not that complicated. There are no
script components, and removing the CSS doesn't speed things up either ...  It
seems to just be a slow table rendering problem ... 

Reproducible: Always

Steps to Reproduce:
Load page and view how slow it is to render. 
Actual Results:  
Page is slow.

Expected Results:  
SHould be zippy!

I will upload a zipped version of hte file, including the original and a variant
that has all CSS explicitly removed.

Comment 1

15 years ago
Created attachment 117874 [details]
ZIP file of slowly rendered page, and associated image files.

ZIP file with slow page. The file testpage-noCSS.html has all the CSS removed, 

and also has <table border="1"...> set so the table borders can be viewed.
Page is fast on Linux trunk build 2003-03-19-05.  Windows-specific? 
Graphics-card specific? Ian, what graphics card and driver revision are you using?

Comment 3

15 years ago
works as fast as ie 5.5 for me using mozilla1.3 on win2k

try removing the body background image and then retesting.

Comment 4

15 years ago
Hmmm. I'm at home now, and tested Mozilla 1.3 under Windows 98 SE, and the page
rendering is snappy -- no problems at all.  And my machine at work is much
faster than the one at home ..... 

So it must be something about the Win2k box at work.... I'll check again
tomorrow, and pass on more details (graphics card, H/W, etc.).

But really, on my Win2k box, it is truly awful ..... 

Comment 5

15 years ago
Ok, The example testpage-noCSS.html from the attached ZIP file is still very
slow.  However, if I remove the background image from the first <table> element
then it is fast. So the problem may have someting to do with overlapped images /

I will attach a revised ZIP file containing three test documents:

testpage.html         -- original (slow) page
testpage-noCSS.html   -- CSS removed -- still slow
testpage-1.html       -- changed testpage-noCSS.html by removing main background
                         image. Now the page is fast!

My win2k machine:
IBM Thinkpad T22, PIII @ 800MHz, 256MB RAM, Graphics: S3 Savage/IX (8MB).
running in dual mode (LCD and CRT). 

Comment 6

15 years ago
Created attachment 118010 [details]
revised set of examples demonstrating slow page redraws.
Attachment #117874 - Attachment is obsolete: true

Comment 7

15 years ago
Ian, i would try to reproduce the problem using the latest mozilla1.4. some
image related bugfixes were checked in by it may have been

Comment 8

15 years ago
I just tested this on my Win2k box using the Mar23 nightly build (2003032308) --
the problem appears to be gone. The page is now fast and responsive, with none
of the sluggishness seen in Mozilla 1.3.  Many thanks to for
the patch -- whatever it was!

I will keep this open until the 1.4beta, and then test and close the bug if it's
still fixed?
Keywords: perf

Comment 9

14 years ago
( .... ok, so I was a bit remiss in retesting on 1.4). Anyway, I've retested
using MOzilla 1.6 and 1.7RC1, and see no rendering / performance problems.  So I
am marking this bug fixed. 
Last Resolved: 14 years ago
Resolution: --- → FIXED

Comment 10

14 years ago
No bug/patch identified.

Resolution: FIXED → ---


14 years ago
Last Resolved: 14 years ago14 years ago
Resolution: --- → WORKSFORME
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