[Matplotlib-users] mpl-1.2.1: Speedup code by removing .startswith() calls and some for loops

[Martin M. <mmo...@fo...>]

Hi,
  I am drawing some barcharts and scatter plot and the speed for rendering is awful once you have
100 000 of dots. I ran python profiler which lead me to .startswith() calls and some for loops
which append do a list repeatedly. This parts could be still sped up I think but a first attempt
is here:


UNPATCHED 1.2.1

real    23m17.764s
user    13m25.880s
sys     3m37.180s


PATCHED:

real    6m59.831s
user    5m18.000s
sys     1m40.360s



The patches are simple and because I see elsewhere in the code list expansions I do not see any
problems with backwards compatibility (new new python language features are required).

Hope this helps,
Martin