Bug 153519

Summary:	scrolling clipped items consumes excessive cpu
Product:	[Unmaintained] plasma4	Reporter:	Oliver Becker <der.ole.becker>
Component:	general	Assignee:	Plasma Bugs List <plasma-bugs>
Status:	RESOLVED NOT A BUG
Severity:	normal
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Compiled Sources
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Oliver Becker 2007-12-05 21:37:41 UTC

Version:            (using KDE Devel)
Installed from:    Compiled sources
Compiler:          gcc version 4.1.1 (Gentoo 4.1.1-r3) 
OS:                Linux

The newsticker applet is extremely slowing down my system. When I am not running it my load average is at about 1-2 % but with this one open it goes up to more than 20 % (running on an intel dual core with 3 Ghz). And because I think the engine is the reason for the slowness (the scrolling text in detail) i'm submitting it here.

Comment 1 Aaron J. Seigo 2007-12-05 21:43:09 UTC

this is because QGraphicsView's clipping mechanisms in 4.3 are horrible. this is a known issue upstream.

we also have the ability, finally, to simple scroll() item content with 4.4, something we don't have in 4.3.

in any case, this is a known issue but not something plasma itself can fix. it should magically go away in kde 4.1, however.

Comment 2 Aaron J. Seigo 2007-12-19 06:49:01 UTC

this is an upstream issue, nothing that we can do about it. i'm not going to keep upstream issues that have been reported alive here. 

i wish there was an 'upstreamed' resolution option (bugzilla is so tuned for non-open source software development it's hardly funny)