Sample_posterior_predcictive() much slower than sample()

Questions version agnostic
1

When running sample_posterior predictive() the model takes a lot of time. Much more than the sample method to get the posterior. Is this normal? I’m using pymc4 due to environment constraints.

2

Posterior predictive is way way faster in PyMC 5 thanks to speed up posterior predictive sampling by OriolAbril · Pull Request #6208 · pymc-devs/pymc · GitHub

3

I was trying to avoid moving to that version but maybe that’s the only way :slight_smile: Thanks!