Does compiling less with wp-less affect load times?

Hello. I’m using wp-less to allow the owner of the blog, Im currently working on, to change background-colors and some other stuff monthly.

In my functions.php, I have this:

if ( ! is_admin() )
wp_enqueue_style( ‘less’, get_template_directory_uri() . ‘/css/style.less’ );

My question is: Is it getting compiled every time a user loads the page, or just if the less file has changed? How does it affect page load time? Can I improve this somehow?

http://wordpress.org/plugins/wp-less/