Speed problems, eh?

// why so slow (especially with different meshes / LODs)?
void SMesh::DrawPart( UINT32 lod, UINT32 part, UINT32 inst )
{
    // cache line on "this"
    SMeshLod& ml = LOD[ lod ]; // new cache line
    SMeshLodPiece& mlpc = ml.Pieces[ part ]; // ...
    SMeshPart& mp = Parts[ mlpc.ID ]; // ...
    SMeshLodPart& mlp = mp.LODParts[ mlpc.LOD ]; // ...

    if( inst )
        glDrawIndexedPrimitivesInst( PT_Triangles, mlp.TriangleCount * 3, MESH_INDEXTYPE, mlp.IBOffset, inst ); // ...
    else
        glDrawIndexedPrimitives( PT_Triangles, mlp.VertexCount, mlp.TriangleCount * 3, MESH_INDEXTYPE, mlp.IBOffset ); // ...
}
// while it might not be so bad in practice
// (most arrays are allocated at +/- the same time
// and thus probably at the same place,
// the unexpectedly slow performance shows it is a problem
// and that there's probably enough of this design
// to make my old Athlon64 CPU beg for mercy.
// P.S. Yes, this is my code.
// P.P.S. I'm fixing it now.