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@nu111: I'm afraid performance issues will be an ongoing thing until we have implemented most of our features. The reason is, we don't want to optimize now and make it harder to add things later. Once all the core features are in (which will be soon), then we can start profliing code and optimizing the slowest bits. Philip has already begun work on a new path finder though, but it's on hold at the moment while we bake some goodies into Alpha 10.