Public bug reported:
This (very nice!) default theme use, for many widgets, the "inset" text
rendering mode from murrina engine. While beautiful, this "engraved"
text rendering effect cause a very high CPU load when a moving window
overlaps another one, static window. This results in the overlapped
window issuing many expose events that can not be served in time, so a
grey trail is visible behind the moving window.
Steps to reproduce this:
a) open a window with some text (eg: obconf -> appearance)
b) open a terminal window and run top
c) open another window and keep moving it over the previous one
d) read, from top, the cpu usage: it will at be near 100% for one core (my
machine has an i5-520 CPU @ 2.4 GHz)
Possibile solutions:
a) enable X-based when-mapped backing store
b) use compiz (or other gl-based wm) as window manager
c) simply disable "inset" text rendering or change default theme
Solutions a) and b) have their problems and controindications (especially for a
resource-contrained distribution as Lubuntu).
Solution c) is the most obvious: simply disable inset text rendering and CPU
usage decrease significantly.
Thanks
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: lubuntu-artwork 0.18
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Thu Oct 20 18:31:43 2011
InstallationMedia: Lubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
PackageArchitecture: all
ProcEnviron:
LANG=it_IT.UTF-8
SHELL=/bin/bash
SourcePackage: lubuntu-artwork
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: lubuntu-artwork (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug oneiric
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https://bugs.launchpad.net/bugs/878958
Title:
Default theme "Lubuntu-default" is too much CPU intensive
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