bash - Why does Cygwin execute shell commands very slowly?

Question

Just tests a very simple command like:

while true; do bash -c "echo hello"; done

You will find how much slow the bash in Cygwin is. Does anybody know why?

It's a fresh install of cygwin 1.7 on win7.

thanks to Jared's testing idea, I modified the command to this(adds bash -c):

time for i in {1..10} ; do bash -c "echo Hello" ; done
Hello
...
real 0m7.711s //it's the problem
user 0m0.091s
sys 0m0.476s

Answer 1

How about excluding Cygwin paths from your antivirus software ?