optimized SimpleEleConstraintEnforcer.addConnectors (O(n^2) to O(nlogn)) #188
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spinachpasta
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SimpleEleConstraintEnforcer.addConnectors has been the performance bottleneck (some large osm files took me 30 hours to be processed!), because it has O(n^2) loop to find points at the same coordinates.
I replaced O(n^2) loop to Kd-tree algorithm which is O(n logn).
This resulted in a huge performance improvement.
In my test cases, the performance was improved from 2000ms to 65ms.