The model is made for subdivision, the stack is not collapsed.
The subdivision modifier is enabled (1.2 iterations in the render)

Polys - 201,885
Verts - 152,437

The set includes a bookshelf with decorative filling, including:
1. Vases
2. Books
3. Sculptures
4. Plants in flower pots
5. Branches

For Corona render, it is recommended to use version 1.5 or higher, as the glossiness of the materials is set considering PBR.