Why is ruby 1.9.3 so slow to start?

y_u_so_slow.txt

$ time perl -e 'print "foo\n"'
foo

real	0m0.009s
user	0m0.004s
sys	0m0.004s
$ time ruby -e 'puts "foo"'
foo

real	0m0.184s
user	0m0.082s
sys	0m0.101s
$ ruby -v
ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin11.4.0]

I get the following with the same version of Ruby.

bash-3.2$ time perl -e 'print "foo\n"'
foo

real 0m0.006s
user 0m0.003s
sys 0m0.002s

bash-3.2$ time ruby -e 'puts "foo"'
foo

real 0m0.016s
user 0m0.012s
sys 0m0.003s

bash-3.2$ time python -c 'print "foo"'
foo

real 0m0.026s
user 0m0.018s
sys 0m0.007s

Hmm..appears to be related to rvm:

$ rvm system
$ time ruby -e ''

real    0m0.026s
user    0m0.003s
sys 0m0.015s