Interesting discovery: Xrender acceleration in KDE 4.4 with Nvidia is very good actually
Today, I found my self wondering what the Xrender acceleration option in KDE systemsettings can be used for.
The last time I had used Xrender as compositor was almost one and a half year ago, when I used fglrx and an ATi card. Xrender was CPU accelerated, so that means slow composition, and thus, it should be used as a fallback if you really want a composited desktop.
Well, today there was a surprise. Xrender compositing with Nvidia, seemed even FASTER than OpenGL. Yes ! I guess that’s happening with the current beta Nvidia driver (195.52) since I read the nvnews forum (I can’t find the thread right now) that there was a huge 2D and Xrender performance gain in the latest driver update on KDE4. The performance is even higher regarding the awful resizing of the windows (it is happening using every Linux driver out there, so I guess it’s an Xorg problem) which is almost eliminated with Xrender composition.
You can try it: System Settings > Desktop > Advanced (tab) > Composting Type "Xrender" and press Apply.
(Some OpenGL 3D effects are disabled of course)
Nice … 😀
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