Tests are taking too long
On my laptop, the Nifty regression test are taking almost 10 minutes at the moment, which starts to get really problematic during development. Is there a chance of reducing test sizes and/or avoiding redundancies in the current tests?
The biggest problem by far is test_correlated_fields.py, which accounts for roughly 40% of the testing time. Next is test_jacobian.py with 20%; next is test_energy_gradients.py.