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Instead of creating a new ndict for each position on every event, we change the values in the object that held the previous position. The creation of new objects on each event was incurring too much overhead. Changes the position type returned by performance module. For improved speed, changes from ndict to a simple Python object, since the cost of setting ndict values is too expensive for the number of times that positions are returned. Also, changes the containing type of the positions to be dictionary with the __missing__ overloaded, instead of the ndict that had that behavior, to reduce the penalty of using ndicts.