some timings which show mercurials way of "cached attributes" is slow

[Ronny Pfannschmidt]

Hi,

I did some timings to compare the following. 
* current way
* using properties on the current way
* non-data descriptor based caching
* non-data descriptor based caching 
  using lambdas to keep the current api

The basic results are:
* non-data descriptors are always faster than the current way
* properties are always slower
* lambda results are always slower 

For code and my timings see the attachment.

Regards Ronny
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