[Qt-interest] Xorg performance

[Matthew Fincham]

On 27-05-10 19:23, Zeljko wrote:
> Matthew Fincham wrote:
>
>
>    
>> Further investigation has found that using the command line option
>> "-graphicssystem raster" improves the performance dramatically.
>> The downside to this is that the application I am working on uses
>> "qt_x11Handler(QPaintDevice*)" to resolve a drawable for a QPaintDevice
>> and this is returning 0 in this mode.
>>
>> Any hints would be appreciated.
>>      
>
> Why don't you use update() instead of repaint() in timer
I found that setting Xorg to use the EXA architecture improved the 
performance dramatically. This poses a problem though, as this software 
is running on older systems that do not support the EXA architecture, 
only XAA.

Does anyone know what is causing this?

It is quite disappointing. Updating to the latest and greatest Qt only 
to find that even a simple program runs with appalling performance, and 
software that was running fine with Qt3, under Qt4, performance wise, is 
unusable.

Many thanks
Matthew Fincham