Hi Sven,
Regarding your questions:

> Of course optimizing the Laplacion solver is still desirable. Have you
> done any profiling on this yet? Is there a way to benchmark it? A
> regression test would also be nice to have for this purpose.

At the moment I haven't done any profiling.  I haven't thought of any benchmarking except for total time spent.  The inner loop runs until convergence so we may have to change that to run for a specific number of times for profiling purposes.

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