Blank lines of code in wp-config and functions.php

I am trying to determine if blank lines in code make a difference to wordpress?

1. Is it ok to have blank lines?
2. If so, is there a time when it is not ok to have blank lines (examples would be helpful)

eg notice these lines from wp-config-sample.php…(these blank lines are in the default file)

/** MySQL database username */
define(‘DB_USER’, ‘username_here’);

/** MySQL database password */
define(‘DB_PASSWORD’, ‘password_here’);

/** MySQL hostname */
define(‘DB_HOST’, ‘localhost’);
2. If not, what do i do about the default install appearing to insert these lines into my wordpress code?

I have manually gone through the above two mentioned files and deleted every blank line i can find. I havent a clue whether it has made any difference to speed or anything else for that matter.