Django: using values() and get_FOO_display()?

Question

I\'m trying to improve some existing code which originally took 3 minutes to prepare a large dataTable (then returned by Ajax). The old code iterated over a large querySet,

Answer 1

iterating over querysets is generally a bad idea, because SQL is executed for each item

That's not true. Below is taken from the official docs:

A QuerySet is iterable, and it executes its database query the first time you iterate over it

I think the problem has to do with the definition of the users from your code. What did you assign to it?