Improving cursor performance with geometry tokens
Geometry tokens were introduced in ArcGIS 10.1 as a performance improvement for cursors. Rather than returning the entire geometry of a feature inside the cursor, only a portion of the geometry is returned. Returning the entire geometry of a feature can result in decreased cursor performance due to the amount of data that has to be returned. It's significantly faster to return only the specific portion of the geometry that is needed.
A token is provided as one of the fields in the field list passed into the constructor for a cursor and is in the
SHAPE@<Part of Feature to be Returned> format. The only exception to this format is the
OID@ token, which returns the object ID of the feature. ...