Hi all,

I was listening in on the last irc meeting and caught an aftermeeting mentioning about bad Qt4 performance. I offered an article and a possible workaround I found recently, in case people are not aware of it, and was asked to bring it to attention to other developers also, so here goes:

I'm suffering bad graphical performance in Qt4 and PyQt4 applications and searched for solutions. I found a post on nokia.com [1] that mentions a command line switch that might help.

In short: adding "-graphicssystem raster" to my Qt4 applications' command line improved performance drastically for me. There's also a method to set it programmatically, and an environment variable [2].

[1] http://labs.qt.nokia.com/2008/10/22/so-long-and-thanks-for-the-blit/ [2] http://doc.qt.nokia.com/4.7/qapplication.html#setGraphicsSystem

Thanks and much regards, Sanne

Hi Sanne,

Thank you for the tip! I may look into setting the variable by default on X11 TDE sessions to aid in improving Qt4 application performance.

Tim