julia fib() 1st-2nd run comparo

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   _       _ _(_)_     |  A fresh approach to technical computing
  (_)     | (_) (_)    |  Documentation: http://docs.julialang.org
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  | | |_| | | | (_| |  |  Version 0.3.4 (2014-12-26 10:42 UTC)
 _/ |\__'_|_|_|\__'_|  |  Official http://julialang.org/ release
|__/                   |  x86_64-w64-mingw32

julia> fib(n) = n < 2 ? n : fib(n-1) + fib(n-2)
fib (generic function with 1 method)

julia> @time fib(25)
elapsed time: 0.002536768 seconds (45200 bytes allocated)
75025

julia> @time fib(25)
elapsed time: 0.000785786 seconds (64 bytes allocated)
75025

julia>