Polygon count
The number of triangles in a model; the main thing that decides how fast it loads and draws.
A 3D model's surface is made of triangles, and the polygon count is how many. A model straight from CAD can have millions, which is fine for engineering and useless on a phone. Web models are reduced, or retopologised, to the number that still looks right at the size it will be seen: tens of thousands for a chair, more for a sofa with visible stitching, far fewer for a lamp.
The count matters twice. It decides file size, which decides load time over mobile data. And it decides how hard the phone works to draw each frame, which decides whether the viewer is smooth or stutters.
Texture resolution is the other half of the file size, and the two are balanced together during optimisation.
See also
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