WP Smush Pro/Revolution Slider slow load speed

Hello, I have installed WP Smush Pro and used it to optimize all images on the site (Wp Smush Capture) but my homepage http://www.alediaprivatetours.com still loads very slowly and Google Webmaster tools is suggesting that I compress and optimize my images (Webmaster Tools Capture). Since WP Smush is saying that I have already done this I'm not sure what else I can do. My Revolution Slider is fairly large but still seems to load very, very slowly. Please advise. Thank you.