I changed the parameters for LensPix in order to see what changed in the power spectrum.
Those plots have been obtained with a zero field for kappa.
Comparison of time execution / loss of energy when lensing with LensPix for different parameters : interp_factors and MPI division method.
Relative difference of power spectrum for different values of LensPix's parameters.
I will check the mocks on this site, and see if we can increase the agreement with theoretical plots.