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Are you sure you meant that *chaco* is too slow? The stated difference of chaco with matplotlib is interactive plotting and I know a bit of effort goes in to making it fast.
You're quite right to pull me up on this. In fact, I've not tested chaco for this type of application so I can't say for sure if it's fast enough or not. I guess, my expectation was that it would not be much faster than matplotlib (given they both use Antigrain for rendering, which tends to be the bottleneck). Whenever I tried any type of anti-aliased drawing (antigrain or cairo) there is always a significant performance hit (on linux anyway).
I'm curious what problems you tried chaco on for which it was too slow.
Sounds like I should revisit chaco (I haven't tried it in a while). My main problem with it is lack of documentation (this is really what has prevented me from testing it extensively). cheers, Bryan
-Travis O.