Polycount is not really relevant, but more so the poly density.
The reason for this is because the GPU only cares about how small the polygons are, because it needs to perform many more calculations if the polygon is under a certain size.
You can use the Poly Density Debug to identify issues.
Where to find this tool?
View → Visualization Settings
Triangle size
What does it mean?
How much red is acceptable?
Not sure, because this depends on min spec testing.
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