How could I make related entries load faster? I need to show a list of users (around 400). No problem, the list loads in 1.5s, for which I could use {% cache %} to speed it up.
Now, the problem arises whenever I want to display the title of an entry related to the user. The log shows 400 extra queries, so a query per user, if I do this:

{% for user in user %}
    {{ user.relationFieldName.first() }}
{% endfor %}


This seems a bit faster, but not fast:

{% for user in user %}
    {{ user.relationFieldName.find()[0] }}
{% endfor %}


Is there a way to get this information directly when querying for users? Or is there another way to speed this up?

Would eager loading these relations through a plugin help? And if so, what service/model/record would I have to extend to go about this?
You could use a template hook to eager load the related data from a plugin and cache the results for future requests.