- Multi-thread BKE_mesh_recalc_looptri. - Add BKE_mesh_recalc_looptri_with_normals, this skips having to calculate normals for ngons. Exact performance depends on number of faces, size of ngons and available CPU cores. For high poly meshes the isolated improvement to BKE_mesh_recalc_looptri in my tests was between 6.7x .. 25.0x, with the largest gains seen in meshes containing ngons with many sides. The overall speedup for high poly meshes containing quads and triangles is only ~20% although ngon heavy meshes can be much faster.