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[Johan Hake <668862@xxxxxxxxxxxxxxxxxx>]

The Graph class looks nice. As mentioned above we need to remove the
random access methods if we are going to use it. It looks like your have
added this functionality so you need to decide.

We could just change to Graph for the storage of the SparsityPattern and
look what our bench-bot tells us?

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Sparsity pattern computation dead slow with 'real' spaces
https://bugs.launchpad.net/bugs/668862
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Status in DOLFIN: Confirmed

Bug description:
The computation of the sparsity pattern is dead slow when real spaces are used, i.e.,

    R = FunctionSpace(mesh, 'R', 0)

To see the problem, compare the neumann-poisson and poisson demos with fine meshes (256x256)