Ninja Forms Perfmatters Delay JS exclusions example. https://perfmatters.io/docs/delay-javascript/

ninja-forms-perfmatters-delay-js-exclusions.php

add_filter('perfmatters_delay_js_exclusions', function($exclusions) {
	if(is_page(275)) {
		$exclusions[] = 'underscore.min.js';
		$exclusions[] = 'backbone.min.js';
		$exclusions[] = 'front-end-deps.js';
		$exclusions[] = 'front-end.js';
		$exclusions[] = 'nf-';
		$exclusions[] = 'jquery.min.js';
		$exclusions[] = 'nfForms';
	}
	return $exclusions;
});