The model is made for anti-aliasing, the stack is not collapsed.
Anti-aliasing modifier enabled (on render iterations 1,2)

Polys - 181,268
Verts - 193 651

The set contains a bookshelf with decorative filling, including:
1. Vases
2. Candlestick
3. Boxes
4. Candles
5. Books
6. Dried flowers
7. Spikelets
8. Photo frames
9. Diffuser
10. Tray
11. Mirror
12. Globe

For Corona render, it is recommended to install a version not lower than 1.5, since the glossiness of the materials is adjusted taking into account PBR.