>>286406323
That's the axis-aligned bounding box. It mainly affects frustum culling I think, and maybe occlusion culling. If it's huge, you probably have a fucked up shapekey. Try dragging each of your shapekeys in the mesh renderer to max. If one of them explodes your avatar, that's what's causing the bounding box to be huge as well. Remove the shapekey in blender to fix.