There's a Wikidata UI Redesign in development [1] which should improve the default site's visual appeal.
That said, while the San Francisco Wikidata page may currently be uglier than its Freebase counterpart, it is not slower. webpagetest.org has the Wikidata page fully loaded at 8.8 s and the Freebase page 11.2 s [2, 3]. And while Reasonator is certainly dog slow (21.2 s to fully load! [4]), its San Francisco page is much more polished than the Freebase's.