Speeding up site-why load css/js on all pages?

Thanks Takayuki,

I found another method that doesn’t entail changing any plugin files, and modified the code a bit. I just insert this once into my theme functions.php. I’m not really a coder but can normally make a few tweaks to get something basic to work. What do you think?
I like it because I can combine it with multiple plugins and should work with plugin updates.
JT70

// DEREGISTER PLUGIN EVENTS
function dvk_dequeue_scripts() {

    $load_scripts = false;

    if( is_singular() ) {

        $post = get_post();

        if( has_shortcode($post->post_content, 'contact-form-7') ) {

            $load_scripts = true;

        }

    }

    if( ! $load_scripts ) {

        wp_dequeue_script( 'contact-form-7' );

        wp_dequeue_style( 'contact-form-7' );

    }

    $load_poll_scripts = false;

    if( is_singular() ) {

        $post = get_post();

        if( has_shortcode($post->post_content, 'poll') || has_shortcode( get_post_meta( get_the_ID(), 'YOUR_FIELD_ID', true ), 'poll' ) ) {

            $load_poll_scripts = true;

        }

    }

    if( ! $load_poll_scripts ) {

        wp_dequeue_script( 'wp-polls' );

        wp_dequeue_style( 'wp-polls' );

    }

}

add_action( 'wp_enqueue_scripts', 'dvk_dequeue_scripts', 99 );