Some of the JS in cs-classic is still probably used and needed on your site. I believe that lighthouse section is more so to determine what code in cs-classic didn’t run at all. These are things we are moving to different files like cs-sliders
as you might have seen and will continue to do to limit the size of JS on everybody’s sites. If you could send me a link to the site I can see what other JS would be good to split to other files as well. Delaying cs-classic is probably going to remove crucial functionality in your site, but you can probably get away with that doing it in our other files. Hope this helped, have a great day.