■ OS Environment : Linux[RHEL, Centos]
■ Implementation Steps :
$ touch /tmp/strace_op
$ strace -s 128 -fvTttto /tmp/strace_op command
NOTE : Analysis content of the file /tmp/strace_op. Note that time stamp has been captured here. So, you can check which system call took much time. If any command takes much time then you can do strace to that command and analysis the output.