Example of Merge Smooth Faces Option in Sweeps
Clear Merge smooth faces to:
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Improve the performance of sweeps with guide curves. Sweeps generate faster and merge between adjacent geometry and edges.
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Segment the swept body at all points where the guide curve or the path is not curvature continuous (see the example below). Consequently, the lines and arcs in the guide curves are more accurately matched.

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Merge smooth faces selected
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Merge smooth faces cleared
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The entities that comprise the Path for sweeps with guide curves need not be tangent.
NOTE: When you clear Merge smooth faces, the potential exists that some features created later might fail due to the changed geometry.