Disable FVM on a single page?

Its not supported by default, however you can code an auxiliary function that runs when the requested url, matches some specific pattern OR by page number / title using conditional tags.

You need to know a little of php coding or hire a developer for that though.
Once you come up with the logic to run something on that url, you can call these filters to prevent FVM from doing anything on that page:

remove_action('wp_print_scripts', 'fastvelocity_min_merge_header_scripts', PHP_INT_MAX );
remove_action('wp_print_footer_scripts', 'fastvelocity_min_merge_footer_scripts', 9.999999 ); 
remove_action('wp_print_styles', 'fastvelocity_min_merge_header_css', PHP_INT_MAX ); 
remove_action('wp_print_footer_scripts', 'fastvelocity_min_merge_footer_css', 9.999999 );
remove_action('wp_print_styles', 'fastvelocity_add_google_fonts_merged', PHP_INT_MAX);
remove_action('wp_print_footer_scripts', 'fastvelocity_add_google_fonts_merged', PHP_INT_MAX );
remove_action('init', 'fastvelocity_min_disable_wp_emojicons');
remove_action('template_redirect', 'fastvelocity_min_html_compression_start', PHP_INT_MAX);
remove_filter('style_loader_src', 'fastvelocity_remove_cssjs_ver', 10, 2);
remove_filter('script_loader_tag', 'fastvelocity_min_defer_js', 10, 3); 

@alignak Thank you so much!

It took a little reading/trying to find out, where to put the remove_action. But now it works as intended! Great!

Maybe someone else will need this info too: I put this in the functions.php of my child theme to prevent html minification on the page with the stub “email-newsletter”.

add_action('template_redirect', 'remove_htmlmin_in_newsletter');

function remove_htmlmin_in_newsletter() {
    if(is_page('email-newsletter')){
        remove_action('template_redirect', 'fastvelocity_min_html_compression_start', PHP_INT_MAX);
    }
}

thanks for sharing @utrenkner.

I had a similar issue but, in my case, it was CSS optimization which was causing some trouble.

In order to fix, I had to use some hooks that have not been mentioned in this thread:

remove_action('wp_footer', 'fvm_add_loadcss', PHP_INT_MAX);
remove_action('admin_enqueue_scripts', 'fastvelocity_min_load_admin_jscss', PHP_INT_MAX);
remove_action('style_loader_tag', 'fastvelocity_optimizecss', PHP_INT_MAX);

In case it can help someone else, this is the code I had to add to my functions.php:

function disable_fvm_functionality() {
		$current_path = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH);
		if( strpos($current_path, '/newsletter/') !== false ) {
			remove_action('wp_print_scripts', 'fastvelocity_min_merge_header_scripts', PHP_INT_MAX );
			remove_action('wp_print_footer_scripts', 'fastvelocity_min_merge_footer_scripts', PHP_INT_MAX);
			remove_action('wp_print_styles', 'fastvelocity_min_merge_header_css', PHP_INT_MAX );
			remove_action('wp_print_footer_scripts', 'fastvelocity_min_merge_footer_css', PHP_INT_MAX);
			remove_action('wp_print_styles', 'fastvelocity_add_google_fonts_merged', PHP_INT_MAX);
			remove_action('wp_print_footer_scripts', 'fastvelocity_add_google_fonts_merged', PHP_INT_MAX );
			remove_action('init', 'fastvelocity_min_disable_wp_emojicons', PHP_INT_MAX);
			remove_action('template_redirect', 'fastvelocity_min_html_compression_start', PHP_INT_MAX);
			remove_filter('style_loader_src', 'fastvelocity_remove_cssjs_ver', PHP_INT_MAX);
			remove_filter('script_loader_tag', 'fastvelocity_min_defer_js', PHP_INT_MAX);
			remove_action('wp_footer', 'fvm_add_loadcss', PHP_INT_MAX);
			remove_action('admin_enqueue_scripts', 'fastvelocity_min_load_admin_jscss', PHP_INT_MAX);
			remove_action('style_loader_tag', 'fastvelocity_optimizecss', PHP_INT_MAX);
    }
}
add_action('template_redirect', 'disable_fvm_functionality');

In my case, I’ve disabled the plugin for all pages that match “/newsletter/” in the URL (replace “/newsletter/” according to your needs or use a different expression to match against).

Note that the remove_action('admin_enqueue_scripts', 'fastvelocity_min_load_admin_jscss', PHP_INT_MAX); is for the wp-admin only, and should not be needed on the frontend.