Is there any known performance impact to possibly overly specific selectors?

ex:
#CategoryList li.Category ul li.product ul li.ciDsc a:hover {}
(vs.)
li.ciDsc a:hover {}

The first case is extremely specific and clues the reader to the structure of 
the document

Does the second case incur less parse/render overhead?

I normally opt for readability, but I have recently executed a styled list of 
links from what was 
once a table-based layout.  The page display performance is pretty terrible.  I 
would post a url, 
but this is part of a redesign rollout that is not yet public.
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