https://bugs.freedesktop.org/show_bug.cgi?id=50868

--- Comment #2 from Fridrich Strba <fridrich.st...@bluewin.ch> 2012-06-08 
01:33:56 PDT ---
What I see here is that the files are a mess to render. They have several
issues:
1) A file of 9 MB is quite slow to parse for us, since the content of the Visio
file is compressed with a custom compression and we have to uncompress them
into memory first before being able to parse it.
2) The files have a fair amount of NURBS. There is no NURBS primitive in ODG,
or SVG. Instead of approximating them using bezier cubic segments, we
approximate them with 200 lines for each two knots. Some of the rendering will
be faster once we change this approach. And I will not mind a help of someone
who has an experience with that. "The NURBS Book" is a good source of ideas how
to do it.

There is a workaround if you are interested for the while: disable antialiasing
in Draw and it will render faster, albeit it will not be as nice as it could.

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