Bug 150294

Summary: slow and choppy scrolling when browsing
Product: [Applications] konqueror Reporter: Vadym Krevs <vkrevs>
Component: khtmlAssignee: Konqueror Developers <konq-bugs>
Status: RESOLVED WORKSFORME    
Severity: normal CC: james, kdebugs
Priority: NOR    
Version: unspecified   
Target Milestone: ---   
Platform: unspecified   
OS: Linux   
Latest Commit: Version Fixed In:

Description Vadym Krevs 2007-09-28 13:56:10 UTC 
Version:           3.5.7 (using KDE 3.5.7 "release 79.2" , openSUSE )
Compiler:          Target: x86_64-suse-linux
OS:                Linux (x86_64) release 2.6.18.8-0.5-default

stal-dev-lx1:~ # cat /etc/SuSE-release
openSUSE 10.2 (X86-64)
VERSION = 10.2

stal-dev-lx1:~ # rpm -q kdebase3 kdelibs3
kdebase3-3.5.7-91.1
kdelibs3-3.5.7-79.2

Open the following URL http://www.hardforum.com/showthread.php?t=1145317 and attempt to scroll the page by either using the mouse wheel or by dragging the scrollbar - CPU usage jumps to 100% (my machine has a 3.2 Ghz P4 with 2Gb RAM), the page redraw is very slow, one can see the it being redrawn in rectangles. No problems with Firefox 2 on the same machine.
Comment 1 Tommi Tervo 2007-09-28 14:09:20 UTC 
Cannot reproduce, page scrolls fine in my low end machines: (tested with IBM T20 P3 700Mhz 256MB and opensuse kdelibs3 3.5.7-71, Athlon 700Mhz 400MB and kubuntu feisty).

Which video card and driver do you use?
Comment 2 Vadym Krevs 2007-09-28 23:00:21 UTC 
NVIDIA Quadro NVS280 with the latest Nvidia proprietary driver.
Comment 3 Maciej Pilichowski 2007-09-28 23:12:16 UTC 
Here scrolling is very smooth (using scrollbar), but CPU indeed goes to 100%. Intel CPU 2GHz, intel 950 integrated chipset.
Comment 4 Stefan Monov 2007-10-09 10:24:24 UTC 
Here scrolling is choppy at first (~7 seconds), taking up 50% CPU, but then becomes smooth with 0% CPU. AMD Sempron 2300+, GeForce 5500 FX, the closed nvidia drivers.
Comment 5 Linus Östberg 2008-04-19 19:26:48 UTC 
About 50% CPU used while browsing the page, but scrolling is not choppy. (Turion 64, 2*1.6 GHz (at 800 MHz during testing), Konqueror 3.5.9 and 4 (trunk, r798696)).
Comment 6 James Spahlinger 2008-04-20 07:45:00 UTC 
Works for me as well in both 3.5.9 and 4.0.3. No lag that I can see. I'd recommend closing this.

Using Gentoo Linux ~x86 (testing in gentoo lingo). KDE 3.5.9/4.0.3 and the majority of packages compiled using gcc 4.3.0.
Comment 7 James Spahlinger 2008-04-25 08:50:30 UTC 
Closing