Comment 24 for bug 748137

Sorry I was working late and I have just got back home. Francesco Miglietta asked me if I was experiencing slowness.
I have two machines.
1 x Laptop AMD L110 1.2GHz, 2GB Ram with ATI X1200 R690 Integrated Graphics ... that is upgrading now and is the target audience of Unity. I'll let you know in 1 hr about the performance.

1 x OpenCL Dev Workstation Sandy Bridge 3.4 GHz Quad,16 GB Ram ATI HD 6870 .. This has been upgraded to Unity and daily PPA + Ubuntu's version of the ATI fglrx proprietary driver.

The black window rendering has now been resolved. As for performance, its fine but then it should be on this system. However I can not test it properly because I keep having to reboot into fail-safe windows graphics mode. This is because there is an issue with the window title bars not being rendered at all in Unity so you can not move the windows around. The Text Tool Bar (File, Menu etc ) Appear in the Unity Top Panel so you can exit the app and reboot, but you can not minimise or maximise App windows.

I do not think this is a Unity issue because even in Compiz Cube, the Top Gnome Panel does not even appear, when you rotate the cube ... it appears that the rotation is not a cube, but a flat 2d desktop that rotates around a central axis. Strange.

laptop almost upgraded will update soon on performance.