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fer@hecate ~ $ echo "rvm_configure_env=(CFLAGS=-O3)" > ~/.rvmrc

fer@hecate ~ $ time ruby -e "count = 0; while(count < 100000000); count = count + 1; end; puts count"
100000000

real	0m6.324s
user	0m6.146s
sys	0m0.004s

fer@hecate ~ $ rvm reinstall ruby-1.9.3-head
(...)

fer@hecate ~ $ time ruby -e "count = 0; while(count < 100000000); count = count + 1; end; puts count"
100000000

real	0m2.730s
user	0m2.718s
sys	0m0.007s

fer@hecate ~ $ rvm use ree-1.8.7-2012.02
Using /home/fer/.rvm/gems/ree-1.8.7-2012.02
fer@hecate ~ $ time ruby -e "count = 0; while(count < 100000000); count = count + 1; end; puts count"
100000000

real	0m23.993s
user	0m23.955s
sys	0m0.002s

fer@hecate ~ $ rvm reinstall ree-1.8.7-2012.02
(...)

fer@hecate ~ $ time ruby -e "count = 0; while(count < 100000000); count = count + 1; end; puts count"
100000000

real	0m23.934s
user	0m23.897s
sys	0m0.002s