172835 - Scrolling on this site suddenly sucks

Status: RESOLVED WORKSFORME

(Core :: Web Painting, defect)

Description

[Boris Zbarsky [:bzbarsky]]

BUILD: 2002-09-30-21 and later Linux trunk builds (up to 2002-10-04-08)

BUG NOT PRESENT IN: 2002-09-29-21 and earlier Linux trunk builds

STEPS TO REPRODUCE:

1) Load http://www.nic.fi/~tapio1/Teaching/Ankkurit.php3
2) Hit the down arrow 5 times.

ACTUAL RESULTS:  very obvious separate redraws for each keystroke; incredibly
                 slow scrolling.

EXPECTED RESULTS: slow, but somewhat smooth scrolling as before.

NOTES: There are two ways I've found to restore the "expected" ("old") behavior:
       1)  Open another tab, switch to it, then switch back to the nic.fi tab
       2)  Minimize the browser window and then restore it

Either action makes things bearable.

Sounds to me like another problem with things maybe not being initialized right...

Sorry about the testcase size; I'll try to reduce if if I have time tomorrow...

Comment 1

[Andrew Schultz]

linux trunk build 2002092921 works ok (about 1 second to scroll).  trunk build
2002100104 has the problem (about 2 seconds)

Comment 2

[Andrew Schultz]

Attachment: testcase

a somewhat reduced testcase.  the problem seems to be that the "hidden"
elements (menu elements in the original URL) are getting redrawn while
scrolling or resizing.

without the -moz-opacity or the small font, it still happens, but it's less
severe.

Comment 3

[Andrew Schultz]

Attachment: testcase with small font

oops.  that was the testcase with normal font

Comment 4

[Christian :Biesinger (don't email me, ping me on IRC)]

not linux specific, seeing on 2002100317 on windows 98 as well.

Comment 5

[earthsound]

Mozilla 1.3, Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.3)
Gecko/20030312, Windows XP Pro, Build 2600.xpsp1.020828-1920

Dell OPTIPLEX GX50, Celerron 1.2GHz, 256 MB RAM, Intel 82810E Graphics Controller

Confirm problems w/ the URL, however, the attached test cases WFM. 

This reminds me of the horrible scrolling/intensive CPU & kernel thrashing I see
@ http://www.hiwaay.net/support/faq/index.cgi?view_category=1&catid=50 (and
everywhere else on hiwaay.net's site). 

Comment 6

[Markus Hübner]

Might this be graphics card related (gfx) ?

Comment 7

[earthsound]

Mozilla 1.4a, Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4a)
Gecko/20030401, Windows XP build 2600.xpsp1.020828-1920

update: URL in original report for this bug is rendered horribly, but slow
scrolling I reported for hiwaay.net is working...

Comment 8

[earthsound]

Attachment: screenshot of http://www.nic.fi/~tapio1/Teaching/Ankkurit.php3

this bug is about scrolling, I know, but that page looks horrible :\

Comment 9

[Dean Peterson]

I reported the rendering problem at the www.nic.fi site in bug 201442 (the
problem shown in the screenshot.)

Comment 10

[Marc Randolph]

http://www.iht.com/

has similar problems with their a story/articles.  Just pick any story from the
main page (which is also rendered poorly) and scroll down (ignore the fact that
you can easily read the whole page on one screen, scroll down anyway).

As expected, happens in both Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US;
rv:1.4) Gecko/20030529 [the 1.4RC1] and Firebird [0.6 milestone].

Comment 11

[Ronald Tilby]

Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8b4) Gecko/20050913 Firefox/1.4
URL & Testcase WFM.  Is this still a problem?

Comment 12

[Carlos Alén Silva]

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:11.0a1) Gecko/20111202 Firefox/11.0a1

Tried both the troublesome web and the small-text testcase. Both seem to scroll normally on Nightly 11.0a1, on Windows 7.

Comment 13

[Marco Castelluccio [:marco]]

Same here. Feel free to reopen if you still see the issue.