ubuntu-x-swat team mailing list archive

[Ali Onur Uyar <653851@xxxxxxxxxxxxxxxxxx>]

The problem does not occur only with Nvidia chipsets but also with Intel Video (Intel GM45). The GUI is sooo slow it is unbearable. Here is one way to replicate the problem:
1. Click on Gnome Main Menu.
2. Start moving the pointer up and down over the menu entries.
3. In a few seconds Xorg will be consuming 50% of the CPU and gnome-panel the remaining 50%.

The problem is not limited to gnome-panel. It seems like any application
that is updating the screen consumes processing time and at the same
time causes the Xorg processing time to shoot up. No complex graphical
operations are required for triggering the problem; opening a GTK menu
in any application (thunderbird, gedit) and scrolling over the menu
items causes excessive CPU utilization. The most notorious example was
opening a gedit instance and scrolling through the File Menu causing
gedit to consume 60% and Xorg consume 40% CPU. It is is also important
to note that scrolling thorugh the Menu items is very slow.

The most annoying aspect of the general sluggishness in the interface is
delays in text input. The characters that one is typing stop from
appearing in the screen and one or two seconds later many characters
appear at once,

The problem doesn't seem to be limited to Compiz or 3D effects either,
because the sluggishness in scroling through the menus can even be
observed after switching from Compiz to Metacity using the Compiz Fusion
Applet.

-- 
xorg is jerky, uses too much cpu, small display bugs
https://bugs.launchpad.net/bugs/653851
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