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[Johan Hake <668862@xxxxxxxxxxxxxxxxxx>]

I suggest two solutions:
  1) Change the internal storage of dolfin::Set from vector to unordered_set.
  2) Remove Set and use unordered_set directly.

With 1) we can easily change the decision in the future, even make it parameter dependent (maybe not, we are not in Python land...)
2) is more clean.

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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)