It is from the discussion from math group.
Point, Line and Polygon now accept multi-coordinate list that can be processed and rendered more quickly by the Mathematica front end than the equivalent individual primitives.
data = Table[{Random[], Random[]}, {100000}];
Graphics[{PointSize[0.002], Point[data]}, AspectRatio -> Automatic]
Graphics[{PointSize[0.002], Point[#] & /@ data}, AspectRatio -> Automatic]
More information: Efficient Representation of Many Primitives
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