With BWP Minify, images are not loading

My site is up but was very slow so I embarked on following the steps on this link

I installed and executed wp-smushit, then uninstalled.
Next, I installed WP Minify but images on the advanced slider and color section video stopped showing.

I added the recommendation below to functions to.php but images are still not showing
“This will exclude layout.css and custom.css, two of the css files that usually breaks the site when included on the compression.”

add_filter(‘bwp_minify_style_ignore’, ‘exclude_my_css’);

function exclude_my_css($excluded)
{
$excluded = array(‘avia-custom’, ‘avia-layout’);
return $excluded;
}

Finally, the third recommendation got things working.
wp-admin > Settings > BWP Minify > One minify string will contain X files at most
I changed this from 10 to 9 and the site started showing images but I don’t quite understand why

In general, I would like feedback on the above steps. I want to know if I ma doing something incorrectly and in particular if it will affect mobile since I already have some huge performance issues that I am working through.