Hi @jjanczyk,
thanks for sharing the project with our support. I can exactly reproduce what you described. The model is quite large and complex with over 20k faces. I think the PERRINN is only half the size of yours. But as long as you can simulate it, we also want to make it work in our viewer. I created an issue for our development team and I will update the topic here. I do not have an estimation on how fast we can deliver an improvement yet, though.
Best Alex