FR 2.1.6 exec module core2duo(or Dual core) poor slow

>* Also I think so
*>* but, only change CPU it(poor slow- Multi core cpu) happen when using
*>* exec modules( same time..) ..??
*
It happen on CentOS5.2 (only using exec module)
exec module is very simple

test_only >>
exec>>
-----
exec {
                program = "/usr/bin/allow_all"
                wait = yes
                input_pairs = request
}
------
allow_all>>
-----
#!/bin/sh
exit 0;
-----