Some of the old Rivendell armors have too many vertices, but in my "limited experience" the main issue is:
too many items defined at a troop at module_troops.py
depending on how the coding was, troops will be expected to auto-equip gear to show a preview, and the gear gets resampled to show a lower vertex count model appropriate to
the size for that item as drawn. Many mods re-edit the rivendell armors to reduce the vertex count; Perisno did that back at build 0.8
Unfortunately I don't do graphics, just code. I'm fair-to-OK with Warband scripting though.