Crystal perfomance

gistfile1.txt

$ crystal build src/hello.cr --release
$ time ./hello 
Hello world

real	0m0.003s
user	0m0.000s
sys	0m0.004s


$ time ruby hello.rb 
Hello world

real	0m0.116s
user	0m0.080s
sys	0m0.039s

But note that the whole difference is probably Ruby's start up. You should probably do something like:

time = Time.now
puts "Hello world"
puts Time.now - time

There I don't think there will be any difference.