What is {built-in method load} when I run cProfile in Python?

Question

I'm running cProfile to benchmark my Django application. The relevant lines look like this:

ncalls  tottime  percall  cumtime  percall filename:lineno(function)
    3    0.027    0.009    0.027    0.009 {built-in method load}
  149    0.004    0.000    0.007    0.000 /usr/lib/python2.7/site-packages/django/db/models/base.py:275(__init__)
  149    0.004    0.000    0.005    0.000 /usr/lib/python2.7/site-packages/django/db/backends/mysql/compiler.py:4(resolve_columns)
  349/72    0.002    0.000    0.007    0.000 /usr/lib/python2.7/copy.py:145(deepcopy)

What is {built-in method load}? It is dominating my execution.