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[titan99 <>]

(Sorry for the bad english)

I measured the time with the incremental_Builder for Polyhedron_3 and the
.clear() Function witch is called also from the Destructor of Polyhedron_3.
I don't understand why the clear Function is much slower as to build the
Polyhedron, and why it is slower to Build the Polyhedron again after it is
cleared.

Times with the Exact_predicates_exact_constructions_kernel at 16896 Facets:
First:
Build: 310ms
Clear: 4444ms
Second:
Build: 1532ms
Clear: 3104ms

Times with the CGAL::Cartesian<double> Kernel at 16896 Facets:
First:
Build: 271ms
Clear: 7330ms
Second:
Build: 971ms
Clear: 5638ms

I need both Kernels because i want to use the 3D-Boolean-Operations and the
3D-Subdivison-Methods.

Does someone know how i can solve the problem and make it faster?

Greeting titan99
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