With Blender ( http://www.blender.org ) there seems to have been a general acceptance that ATI cards were very slow at certain things ( mostly selection ).
Someone did a bit of research, and found that there was a basic issue with the GL_SELECT functionality speed - older drivers worked well with this OpenGL feature, but newer drivers are drastically slower.
As proven in the article at http://www.cs.usyd.edu.au/~tapted/slow_glselect.html, these performance issues were only introduced in fairly new versions of the drivers.
This issue affects users of 3D modelling packages, comments can be viewed by Blender users on this very issue here…
What is the best way to inform ATI developers of this issue? I posted a bug, but I’m being given the typical support brush-off with regards getting answers ( ie install the older drivers ) rather than a solution ( the dev department are aware of the issue, and are working on a solution )