Ok, for anyone following my adventures optimizing clj-uuid, I've gotten 
another substantial win.   
Check it out:    http://danlentz.github.io/clj-uuid

#'uuid/v1:                    443 nanoseconds
#'java.util.UUID/randomUUID: 2012 nanoseconds

Also, the test suite has much greater coverage with individual tests for 
each v1, v,3, v4, v5 uuid version.
And, finally, there more interesting notes about some of the esoteric 
details of the node-id representation
and the way it is calculated to disambiguate it from any legal 802 MAC 
hardware address.  And more.... ;)


======================================================================

user> (criterium/bench (uuid/v1))

Evaluation count: 139356300 in 60 samples of 2322605 calls.
Execution time mean: 443.707611 ns


user> (criterium/bench (java.util.UUID/randomUUID))

Evaluation count : 30850980 in 60 samples of 514183 calls.
Execution time mean : 2.012861 µs


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