Re: [Matplotlib-users] pcolor getting slow

[Eric F. <ef...@ha...>]

jinbo wang wrote:
> Hi dear users,
>    Recently I found pcolor took tremendously longer to draw a figure 
> than contour or imshow. I am wondering if anyone had the same 
> experience, or anyone knows why? Thank you very much!

Yes, pcolor is inherently very slow, but flexible.  Imshow is very fast, 
but restricted in some ways (rectangular grid), flexible in others (it 
has a ridiculous number of interpolation options).  Contouring is a 
completely different sort of operation.

Pcolor is slow because it uses a patch collection, which is not very 
quick to render; imshow goes straight to C++ code for rendering, and 
because of the simplicity of the imshow input, that code can be highly 
optimized.

You might try substituting pcolormesh for pcolor.  It is not quite a 
general and flexible, but it is much more highly optimized for rendering 
with Agg.

Eric

> Jinbo
> 
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