483394 - Very slow scrolling/rendering

Status: RESOLVED DUPLICATE of bug 487267

(Firefox :: General, enhancement)

Description

[L. Mohan Arun]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2a1pre) Gecko/20090313 Minefield/3.2a1pre
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2a1pre) Gecko/20090313 Minefield/3.2a1pre

This URL given when it has loaded completely is very slow to scroll down and render properly - it is significantly rendered faster in IE7. May be because it has lot of big images, but how come IE7 is faster for the same page?

Reproducible: Always

Steps to Reproduce:
1. Go to URL
2. Try scrolling down
3. Hiccups/delays in rendering very noticeable
Actual Results:  
Time delay in rendering

Expected Results:  
Faster rendering - if iE can do it then so can Firefox or so should

Comment 1

[Tyler Downer [He/Him]]

Try in safe mode. Even for me in IE7 that page takes a long time to load.

Comment 2

[L. Mohan Arun]

Same with this URL
http://www.noupe.com/php/10-ways-to-automatically-manually-backup-mysql-database.html

therei s a noticeable scrolling/rendering delay in the latest version of Minefield (20090315 nightly). But my IE7 is faster for all noupe.com pages. Faster scrolling, faster rendering. I tried with Minefield safe mode, same issue. Also unable to scroll until the page loads completely in Minefield.

Comment 3

[Karel Jára]

I can confirm this on other sites.

Let’s compare with the bugs (I’ve commented more on the first of them.):

Bug 480806 – Scrolling is very slow When the page is made a full zoom.
Bug 425234 – Full page zoom very slow on ajaxian.com
Bug 452714 – W3C's page scrolls very slowly

Comment 4

[Tyler Downer [He/Him]]

I still am not seeing any issue with that site. It is very long, which means that as it loads it will knock your view up, but not sure what the issue is. Out of those bugs that you gave, Bug 452714 is the only one that really looks related. The others are on zoom, which may be the same thing, but right now is too early to tell.

Comment 5

[L. Mohan Arun]

The rendering delay is very noticeable with FF. Even IE8 renders the same page faster while still scrolling.

Comment 6

[Tyler Downer [He/Him]]

Does it happen in a new profile?

Comment 7

[L. Mohan Arun]

"new profile"? Do you mean safe mode?

Comment 8

[Tyler Downer [He/Him]]

http://support.mozilla.com/kb/Profiles, it is different than safe mode.

Comment 9

[Karel Jára]

Yes, it happens in new profile, safe mode, new profile in safe mode. It’s reproducible always. Maybe it’s more remarkable when the smooth scrolling is turned on.

Comment 10

[L. Mohan Arun]

Sorry had been busy, didnt have time to check out the Profiles as this is new to me, but the issue is occurring in safe mode also.

Comment 11

[Karel Jára]

Sorry for posting twice in a moment.
I think that it might be related to the problems with zoom, because zoom only makes worse what is already happening without zoom. So it might be the same problem.
I just added those bugs to show that there are more similar problems.

Comment 12

[cmtalbert]

It seems like from comment 3 that we have four bugs (including this one) that are all about the same thing.  Can someone come up with a minimized test case that demonstrates the slow scrolling problem and duplicate all the other bugs to that one?

@Tyler, this might already have a duplicate somewhere in the Core/Layout* components, if you want to hunt it down.

Comment 13

[Dimitrios]

Ok, maybe I  will regret for that but I have to duplicate this one to a similar bug which has a minimized test case. Please don't spam the other bug with confirm comments.