Ethan Furman added the comment:
Yup, you have it figured out. It's the lookup that is the slowdown.
When performance is an issue one of the standard tricks is to create a local
name, like you did with "tiny = Category.tiny".
For the curious (taken from the docstring for Enum.__getattr__):
We use __getattr__ instead of descriptors or inserting into the enum
class' __dict__ in order to support `name` and `value` being both
properties for enum members (which live in the class' __dict__) and
enum members themselves.
It is possible to store all the enum members /except/ for 'name' and 'value' in
the class' __dict__, but I'm not sure it's worth the extra complication.
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title: Enum comparisons are 20x slower than comparing equivalent ints -> Enum
member lookup is 20x slower than normal class attribute lookup
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<http://bugs.python.org/issue23486>
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