Rich has fixed this on master:
http://github.com/clojure/clojure/commit/e354b01133e7cff8dc0d0eb9e90cde894c12e127
Thanks for the report!
Stu
> I have some code that counts the elements in a list that map to true
> in a lookup table, looking something like this:
>
> (def lookup-table {1 true, 2 false})
> (def elements (range 1000000))
> (count (filter lookup-table elements))
>
> On my machine, with server mode enabled, the count + filter got ~10
> times slower when I updated from 1.3 Alpha 1 to 1.3 Alpha 2:
>
> (Alpha 1)
> user=> (time (count (filter lookup-table elements)))
> "Elapsed time: 181.262702 msecs"
> 1
>
> (Alpha 2)
> user=> (time (count (filter lookup-table elements)))
> "Elapsed time: 2017.744155 msecs"
> 1
>
> Which is weird because looking up elements in the table did not become
> any slower:
>
> (Alpha 1)
> user=> (time (doseq [x elements] (lookup-table x)))
> "Elapsed time: 159.033341 msecs"
> nil
>
> (Alpha 2)
> user=> (time (doseq [x elements] (lookup-table x)))
> "Elapsed time: 159.965861 msecs"
> nil
>
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