Comment 16 for bug 1222602

I have tried the solution from comment #6 and it works. It would be helpful to understand why this works. Digging through the comments it looks like mesa uses not the GPU acceleration when the variable is not set. This looks like a design error in mesa. Maybe mesa developers should be asked about this. However, I have tried gnome-shell (before adding the environment setting) and it worked like a charm indicating that gnome-shell sets this variable on its own or initializes mesa differently. Considering gnome-shell was freaking slow compared to unity in 13.04. there must have been a not so wise change in unity.