266810 - Large document consumes several times more memory than IE

Status: RESOLVED WORKSFORME

(Core :: Layout, defect)

Description

[Kevin Ar18]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.3) Gecko/20041013 Firefox/0.10
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.3) Gecko/20041013 Firefox/0.10

The document as indicated by the above URL consumes several times more memory
than in IE.  The actual file, as indicated on my system, is 9.48MB.  During
testing, Firefox consumed over 200MB of memory, whereas iexplore.exe +
explorer.exe consumed no more than 75,000 KB
OS: Windows XP Home


Reproducible: Always
Steps to Reproduce:
1.
2.
3.

Comment 1

[Boris Zbarsky [:bzbarsky]]

I see about 130MB being used with a current Linux trunk build.

We have existing bugs on this sort of thing; it'd be useful to narrow down
whether particular sorts of content are responsible.

Comment 2

[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
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If it is not a problem any longer, you need take no action. If this bug is not
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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 3

[Wayne Mery (:wsmwk)]

bz in comment #1:
>it'd be useful to narrow down whether particular sorts of content are responsible.

true, but perhaps difficult - the page has over 8,000 tables

currently the file size is 16MB. in round numbers, rendering is:
 200mb trunk on win2k**
 200mb 2.0.0.3 on XP
 150mb ie7 on XP
 100mb ie6 on win2k

**Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9a5pre) Gecko/20070530 Minefield/3.0a5pre

In 2.5yrs compared to commment 0 the html file doubled in size - an estimated guess (if comment 0 numbers are deltas) is IE (IE7) memory usage has doubled, FF has decreased by 50% between gecko 1.7 and 1.8

didn't check to see if the URL is in the same ball park as bug 216418 and bug 145425

Comment 4

[Wayne Mery (:wsmwk)]

(In reply to comment #3)
>...
> In 2.5yrs compared to comment 0 the html file doubled in size - an estimated
> guess (if comment 0 numbers are deltas) is IE (IE7) memory usage has doubled

In my dreams IE has doubled :)   Actually it has just not improved as FF has (assuming doubling the file size would double memory usage)

Comment 5

[Marco Castelluccio [:marco]]

I think this bug could be closed as worksforme as now Firefox 8.0a2 uses more or less the same memory of IE9. Adding to MemShrink.

Comment 6

[Nicholas Nethercote [inactive]]

Closing, based on comment 5.