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Fix massive DSO-API performance issue, due to
deepcopy()
DRF performs a
deepcopy()
of theserializer._declared_fields
before it will handle the request. This is analogous to how Django forms work, and updating the fields with request state and 'parent' references.Since the
deepcopy()
also touched dataset definitions of Amsterdam Schema, it basically took 14sec to copy all those dicts as well. This can be avoided, bringing to performance of DSO-API back to reasonable levels.