[Smush Pro] Page Speed insights

yes , i tesdet the mobile site on: https://developers.google.com/speed/pagespeed/insights/?hl=de&url=http%3A%2F%2Fderhundeflo.at%2F
and they prefer to install the Smush Pro to get faster pictures and page load
so i ordered the smash pro but i also have the same bad page speed insights like before
have you an idea why the plugin don´t change the mobile performane, thank you very much & best regards Thomas