Deregister JS and CSS entire site except on all posts

Hi there,

can you explain why you would want to do this?
The theme relies on whatever CSS or JS it loads, without it the site will break.

We have to use a Plugin which seem to make the website very slow.

This snippet e.g. restrict loading of a calendar Plugin on all pages except on Page "Events":

add_action( 'wp_print_scripts', 'my_deregister_javascript', 100 );
if ( !is_page('Events') ) {
wp_deregister_script( 'wpng-calendar' );
wp_deregister_script( 'date-js' );
wp_deregister_script( 'thickbox-js' );
wp_deregister_script( 'jquery-js' );
wp_deregister_script( 'wiky-js' );
}
}

But what I need is to load the Plugin on single Posts and restrict loading anywhere else.

So you should be able to change the conditional to not posts ie. this:

!is_page('Events')

becomes:

!is_single()

This article explains how to add PHP:
https://docs.generatepress.com/article/adding-php/