Upgrading to the premium plugin allows you to unload additional pages with unused styles & scripts, such as:
Taxonomy sites, such as default categories for WordPress, tags and custom built ones, such as WooCommerce categories of items.
Author pages (for example, the page that displays all posts published by a particular author, defined by the is author() function)
WordPress Search Page Default
WooCommmerce Search Page (which has the same settings as the actual shop page found via the function is shop()))
404 page (not found): this one is as light as possible and many of the CSS and JavaScript files that are required here (detected through the 404() function) are less likely to be
Date Archive Page: This is any page that retrieves items detected by the date filtered by the is date() feature.
As for loaded JavaScript scripts, it is possible to add attributes such as defer and async.
There are a plethora of techniques that are often used to postpone parsing, but the easy and preferred technique is to simply defer JavaScript loading until it is required. It is next suggested that you use the