[cairo] Possible issue with long paths being slow

[Stuart Axon]

I came across this (closed) bug in a downstream project
https://github.com/JuliaGraphics/Winston.jl/issues/89
Which seems to say that plotting paths in Cairo with a large number of line segments can be slow.
Is this a known thing, it seems a little strange from the outside ?(especially as they are speeding it up by changing their code to add moveto, then draw a separate segment).


S++
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