Thus the distinction has become the source of a lot of brittleness, bugs, and performance problems.Ī better solution is to move to 100% hardware accelerated OpenGL 3D support, with 2D becoming just a subset of 3D rendering. This blurs the distinction between 2D things and 3D, as it adds 3D effects into what was once exclusively 2D.

until compositing (compiz, kwin) entered the picture. This had some buggy corner cases, but more or less worked. the NoAccel option).ģD acceleration was provided via the Direct Rendering Manager, which worked by mapping 3D rendered pictures on top of the 2D picture. In cases where this was broken or unavailable, one could fall back to software rendering (e.g. 2D acceleration was provided by the venerable XFree86 Acceleration Architecture (XAA), which makes the video card's 2D hardware acceleration available to the X server. Historically, a distinction has been made between 2D and 3D acceleration.

Rather, see X/Troubleshooting/HighCPU instead. glxgears is not a benchmark, don't use it!ĬPU usage is high. 3D video game FPS measures are significantly lower than previously.Switching compiz off makes performance significantly better.Switching to UXA makes performance issues worse.Switching to UXA or XAA makes performance issues go away.With compiz enabled, some animations such as desktop switching or compiz cube view are not smooth and take longer to complete than previously.Problem: EXA and UXA (some applications) slow due to 'a17 swizzling' bug.Problem: Huge performance drop with UXA due to tiled rendering disabled.

Check graphics card ubuntu