I basically ported my frustum culling from C# to F#. The port is pretty much line for line, imperative style.

I thought the two would the on paar, but the F# one seems to be outperforming the C# version by 0.005 seconds.

In a realtime 3D application thats 3 frames saved.

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Any ideas why this might be the case?

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C# - https://github.com/geoeo/henzai/blob/master/Henzai.Core/Acceleration/MeshCuller.cs

F# - https://github.com/geoeo/henzai/blob/master/HenzaiFunc.Core/Acceleration/Culler.fs

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Calling Code - https://github.com/geoeo/henzai/blob/master/Henzai/SceneContainer.cs#L41