Hello,
You are correct, creating a one-to-one relationship can potentially create more queries and hurt performance if you are not careful. However it can also speed up certain queries if you don't need that information all of the time.
If you are worried about the performance, I would suggest looking into select_related and prefetch_related. Select related will grab your Users and user profiles in one query, which can be faster. Prefetch related will fire off a query for each prefetched item, so one for users and one for user profiles, which isn't useful here.
https://docs.djangoproject.com/en/2.1/ref/models/querysets/#select-related
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