Did you read the entire thread?
both Jason and Leon (who originally posted) admit that this was the problem...Stuart even opened this issue:
https://github.com/technomancy/leiningen/pull/1230

the very last post reads:

I should follow up on this and clarify that core.matrix's esum is in fact as fast as Java -- I apologize for the false statement (I was unaware that new versions of leiningen disable advanced JIT optimizations by default, which lead to the numbers I reported).

Jim



On 21/06/13 14:54, Michael Klishin wrote:
2013/6/21 Jim - FooBar(); <jimpil1...@gmail.com <mailto:jimpil1...@gmail.com>>

    If you're using leiningen, add this entry to your project.clj and
    rerun your benchmarks.

    :jvm-opts ^replace []


Original post suggests the code is executed by building an uberjar running java -jar target/…
so Leiningen default JVM options are not relevant.
--
MK

http://github.com/michaelklishin
http://twitter.com/michaelklishin
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