When loading graphs, if ontology defined property relations exist, they tend to come in slower than other concepts. See 'artery' in the link below. It is possible that the extreme slowness that one can exhibit is due to too many relations from 'artery' outward.
It is no longer slow. I changed the logic around relations and expansions for issue #517, and the artery node loads quick enough now, with a short delay past the inheritance relations.
When loading graphs, if ontology defined property relations exist, they tend to come in slower than other concepts. See 'artery' in the link below. It is possible that the extreme slowness that one can exhibit is due to too many relations from 'artery' outward.
http://127.0.0.1:8888/conceptPathToRoot.html?gwt.codesvr=127.0.0.1:9997&initial_vis=term_neighborhood&ontology_acronym=UBERON&full_concept_id=http%3A%2F%2Fpurl.obolibrary.org%2Fobo%2FUBERON_0006591&restURLPrefix=data.bioontology.org