Chair Gunnar:
645 x 645 x H 880 mm

https://ngvk-mebel.ru/collection/povorotnye-stulya/product/stul-gunnar-gunnar-360-grad-tsvet-seryy-vega-88-miami-459-tkan-chernyy-karkas-disaur?variant_id=2232000849 

Without Turbosmooth modifier:
Polys: 3 336
Verts: 3 496
With Turbosmooth modifier iterations 2:
Polys: 106 000
Verts: 53 801

Displacement map is used;
Turbosmooth modifier with Isoline Display is applied to the necessary objects;
There is an FBX file (if necessary, apply the Turn To Poly modifier to the FBX file);
For Corona render, it is recommended to use version 1.5 or higher, as the glossiness of materials is set with PBR in mind.