Overhead in 14.04 Comparing Xubuntu and Lubuntu

John Hupp lubuntu at prpcompany.com
Mon May 12 14:11:53 UTC 2014

On 5/11/2014 11:45 PM, Aere Greenway wrote:
> On 05/05/2014 10:08 AM, Aere Greenway wrote:
>> Xubuntu Results:
>> After booting, and signing-in, it takes a long time for the icons to 
>> appear on the screen.  The CPU-graph applet on the task-bar stayed at 
>> 100%.  When the icons finally appeared on the screen, the CPU-graph 
>> applet finally went down to 83% usage, with no windows active.
>> I started up a terminal session, and ran a "top" command in it. That 
>> showed that the Xorg process was using around 64% of the CPU (it 
>> varied between 63% and 66%, but most often near 64%). There was some 
>> percent going to the CPU-graph (and System Monitor applets) in the 
>> task-bar, but not anywhere near as much as the Xorg process.
> All:
> I have a few more observations and ideas on what might be causing the 
> graphics overhead on Xubuntu.
> First, Xubuntu (or UbuntuStudio) performs much better on a machine 
> with a graphics card that can perform graphics acceleration.
> Second, on the machines without graphics acceleration, on Xubuntu, the 
> mouse-pointer is constantly 'flickering', as if it is being re-painted 
> over and over again, as fast as the CPU can re-paint it, even when the 
> mouse pointer is not moving.  This 'flickering' of the mouse pointer 
> does not occur on machines with a NVIDIA card.

I think the pointer flickering is a simple consequence of the state of 
high-CPU usage.

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