Version: (using Devel) OS: Linux Installed from: Compiled sources When I click on "Show Dashboard" and grab on one of the widgets' handle to move it around, it's orders of magnitude slower than if I minimized/closed all windows and move the widgets using the view instead. I'm using KDE 4.2 beta 2 in Kubuntu 8.10 (packages provided by Kubuntu). I think the issue should be pretty easy to simulate. Thanks!
As per Aaron's advice (http://aseigo.blogspot.com/2009/01/bugskdeorg.html): [wongcs@phrenic:~]$ kde4-config --version (01-07 13:48) Qt: 4.4.3 KDE: 4.1.85 (KDE 4.1.85 (KDE 4.2 Beta2)) kde4-config: 1.0
thanks =) btw, the reason for this, at least with desktop effects, is probably multiple: it's a second view on the same part of the scene, so it's painting twice (once on each scene) and while it is painting it is also blending with the other windows behind it, too. on my machine it's slower when desktop effects are on, and faaast when desktop effects are off. so .. some optimizations for the desktop effects scenario are probably needed.
On current trunk (r959285), Qt 4.5.0, xorg 1.6.1 and nvidia drivers 180.44, moving plasmoid on dashboard is fast like the "normal" view.