Programs that test vertex shader performance are as rare as those that test pixel shaders. Up till now 3D Mark 2001 SE has been the only program that provides a dependable test for these features. Now, Matrox has come out with its own vertex shader test, called SharkMark.
Here, Parhelia clearly moves ahead of the competition. According to Matrox, this is due to the Quad-Vertex Shader Arrays.