Relation tab performs an expensive search on rendering

When rendering the relation tab, an expensive sql query is done to retrieve all but the document.
This request is done by the relation_search page provider
/nuxeo-platform-relations-web/src/main/resources/OSGI-INF/contentviews-contrib.xml

          <fixedPart>
            ecm:uuid != ? AND ecm:mixinType != 'HiddenInNavigation' AND
            ecm:mixinType != 'Folderish' AND ecm:isCheckedInVersion = 0
          </fixedPart>
        </whereClause>
        <sort column="dc:title" ascending="true" />
        <pageSize>5</pageSize>

This request is done each time the relation tab is rendered.
This request should be done only when searching for a document to create a new relation.