I have run into a problem with some of my simulations where the first frame takes forever to compute, even freezing my scene, but if it does make it past the first frame, then it runs a lot faster. Any tips on why this could be happening?

My instincts tell me it is a combination of the initial size of the fluid container + the resolution. Still, I would like to optimize if possible, to reduce this start frame time.

This probably won't do anything, but it's still worth a shot: try updating your version of H or renewing your license

Thanks for the reply. It is definitely dependent on my scene, as it doesn't happen in a blank scene, so I'm confident it isn't a version issue. It's just weird when the first frame takes a long time, but after that, the sim runs at a “normal” speed

The first frame is always at full size, and then it can determine how to resize the volume for the next substep based on the data in the full volume.

Thanks! That makes a lot of sense.

Cheers!