I don't make mmd ports. But it wouldn't surprise me if some of my models have been

Even went through the effort to painstakingly setup the physics for the dress

OHHH that does sound cool

HUH? What does is look like

The guy on the cover art looks like medieval dexter morgan

Dynamic Camera and Dialogue system with dialogue trees implemented.

He is singing to you the song of his people 🤗

If your hard drive does that then I'd say its bad, but since this is your cpu I think its just struggling to keep up with what ever it is you're doing computationally.

ADIDOOO

Faking Direct X Fur in Unity by baking a specialized shader out of blender to planes.