[Dune] [#742] performace loss between 1.2.2 and 2.0

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FS#742 - performace loss between 1.2.2 and 2.0
User who did this - Christian Engwer (christi)

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Hi Andreas,

I had a look at it and the biggest performance loss seems indeed the shared_ptr. If I just remove the shared_ptr I gain most of the performance again.

Then there are some smaller things. In your patch, you are back to the situation where the position is updated in each increment. This is something I'd like to avoid, because many applications would benefit from a faster "iterate-only" pattern.

Christian
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