I am running an OpenMx under 32-bit Windows (since as I understand it is not possible to do it under 64-bit?). My data file contains appr. 30000 twin pairs, and I am running a bivariate common sex-spesific ACE model with two moderators. It seems like either I have written a very slow script (although parameter estimates are reasonable) or it is just too many parameters to estimate (110 in a saturated model). It was taking so much time that in order to verify that my script actually works, I took only 1000 twin pairs for the analysis. But even then it takes appr. 2.5 h to run a saturated model! Is it normal with this number of parameters or it sounds like a mistake in the script? If former, is there a way to speed up the process?
Thank you beforehand.