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[Anders Logg <logg@xxxxxxxxx>]

Here are some results from a simple benchmark of the new mesh library:

Test                                  | Old mesh  New Mesh
--------------------------------------------------------------
Reading and initializing 1000 times   |  0.90 s    0.21 s
Refining mesh uniformly 8 times       |  27.2 s    2.14 s
Iterating over connectivity 100 times |  18.2 s    1.86 s
Memory usage                          |  281 MB     43 MB

Initial mesh: 8 vertices and 2 cells
Final mesh:   263169 vertices and 524288 cells

The speedup is around a factor 10. :-)

The memory usage has also been reduced. It's now at a minimum (give or
take a few bytes).

/Anders