[matplotlib-devel] slowdown with big invisible lines

[Pierre H. <pie...@cr...>]

Hello,

This may be a silly question, but I'm wondering what happens in
Matplotlib rendering when there is a "big" Line2D object (say 10**7
points) added to an Axes, with *visibility set to false*.

Here is an tiny script meant to be run interactively (say with Python in
pylab mode) step by step :
https://gist.github.com/3638471

I'm experiencing a strange slowdown of Axes rendering when such a "big
line" is added to the Axes, despite the fact it is invisible. So I'm
wondering if this is an expected behavior or a some kind of bug. Or
maybe it's a well known fact, already fixed in the upcoming 1.2 release
and in that case sorry for the duplicate.

Best,
Pierre

PS: I'm using Matplotlib version 1.1.1rc2, from Debian Testing. Today
TkAgg backend, but the other day same problem happened with Qt.