The default setting of POV-Ray, which is

+A0.3
+R3
+J1

is sufficient for most scene. However, in some cases, we need a higher accuracy
to have smooth edges. For examples, I found we have dark pixels at the edges of
spline made of sphere when the path is a straight diagonal line. However, this
is highly scene-dependent (light, contrast, etc).

All three parameters can contribute to a smooth edge, but massively increases
the rendering time in this order (R > A > J).

In most cases, it is just overkill.

Do you have any suggestion for optimising these values to get the highest
visible quality while minimising the rendering time?

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