[Plugin: TBTestimonials] Howto use "jQuery Cycle Lite" instead ?

yes it’s possible:

upload the jquery cycle plugin file to a /js subfolder in your theme,
in your functions.php file, create a new function:

add_action('wp_enqueue_scripts','my_load_cycle_lite');
function my_load_cycle_lite(){
    // replace TB testimonials script with a lightweight version
    wp_deregister_script('jquery-cycle');
    wp_register_script('jquery-cycle', get_stylesheet_directory_uri() . '/js/jquery.cycle.lite.js', array('jquery'), '', true);
    wp_enqueue_script('jquery-cycle');
}

Thank you Paul!

I’m going to try this out soon and see if it successfully works.