$ time perl fifi.pl /usr/lib/perl5
83

real	0m0.991s
user	0m0.756s
sys	0m0.228s
(0) 2032: murphy@luna ~ $ dmcs -optimize+ fifi.cs && time ./fifi.exe /usr/lib/perl5
83

real	0m2.414s
user	0m1.304s
sys	0m1.160s
(0) 2033: murphy@luna ~ $ fsharpc --optimize+ fifi.fsx && time ./fifi.exe /usr/lib/perl5
F# Compiler for F# 3.0 (Open Source Edition)
Freely distributed under the Apache 2.0 Open Source License
83

real	0m2.132s
user	0m1.268s
sys	0m0.912s