[Dev] Item performance update

[John Anderson]

A simple optimization, which avoids calling the repository to test for 
the presence of a method, increased the performace by a factor of 6. See 
the updated link for details:

http://wiki.osafoundation.org/bin/view/Chandler/ItemPerformance

John Anderson wrote:

> While tracking down some UpdateUI performance problems I did a 
> comparison of the speed of attribute access vs. wxWidget python 
> attribute access that you might find interesting:
>
> http://wiki.osafoundation.org/bin/view/Chandler/ItemPerformance
>
> John
>
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