117879 - Slow scrolling with lots of PNG's in a table, unlike IE

Status: RESOLVED FIXED

(Core Graveyard :: GFX, defect)

Description

[Nick Richards]

http://www.bullseyecrosshairs.com/hlsites4.shtm scrolls very slowly, probably
due to the fact it's got several dozen PNG images in a table.

IE 5.5 seems to perform fine with the page on my 1200 Mhz AMD.  Mozilla
(2001122106), however, halts for like 1 second for each movement of the page
whereever I scroll around.

I have a local copy of the HTML and Images.  If the website doesn't have
reproducable content when someone goes to verify this bug, email me and I'll
forward the Web Archive (saved via IE 5.5) to you.

Comment 1

[Boris Zbarsky [:bzbarsky]]

compositor for a start.

Comment 2

[Dimitrios]

There are quite a few perf bugs about png images. Didn't find more than one not
dealing with table or body background images: bug 116257.

Comment 3

[Chris Petersen]

Confirming issue in the Jan 2nd build (2002-01-02-03) under Windows ME.

Comment 4

[Kevin McCluskey (gone)]

Don, is this fixed by your tiling fix?

Comment 5

[dcone (gone)]

The background fix does not effect this at all.  It is very slow.

Comment 6

[tenthumbs]

FWIW, http://www.bullseyecrosshairs.com/newbg8.png is a huge image with 
a fully opaque alpha channel. Most of the image is just black.

--->pngcheck newbg8.png
OK: newbg8.png (1565x3949, 32-bit RGB+alpha, non-interlaced, 99.8%)

Comment 7

[Jure Repinc (JLP)]

Also very slow scrolling here.
Mozilla 2002020208 on Windows XP Pro, AMD Athlon 1333MHz

Comment 8

[viipale+bugzilla]

Confirming on W2K and Mac OS X
Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.8+) Gecko/20020215
Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-US; rv:0.9.8+) Gecko/20020212

Comment 9

[Dimitrios]

Platform->All, OS->All, per last comment.

Comment 10

[dcone (gone)]

There is alot more than just the scrolling.. I think.  My machine was brought to
its knees when loading.. or scrolling using the unfixed Mozilla.  I think there
is some script being executed to.. or animations.  Anyway.. I have fixes in for
alpha tiling.. and patblt tiling from other bugs.. and I noticed a huge
improvment of speed.  I dont think it will get much better as far as tiling
goes..unless we cache.  I am marking this as fixed because of the noticible
difference in speed increase from the other two fixes.  My comment above was in
reference to another tiling bug fixed.