mesh_make_atlas performance degrades with larger meshes on iOS build

[Volutionn]

Hi, I'm encountering a performance issue with mesh_make_atlas when using Geogram on iOS. The function works fine for small meshes, but I'm experiencing a severe slowdown with larger meshes. The issue seems to occur when the vertex count exceeds ~16,000 (tested on a simple plane by progressively subdividing it).

Do you have any ideas about what might be causing this performance degradation with larger meshes? Are there any optimizations or settings I should consider to handle larger meshes efficiently?

Additionally, I'm getting this warning: Warning: Could not initialize SuperLU extension when trying to use ABF++, which causes it to fall back to LSCM. Do you know if I should be able to make SuperLU work on iOS?

Thank you!