The only way to make it faster is to cache them and serve them through CDN, but you're right, it will be a problem if you always update your site's content/logos. Cache is against change, hence, you have to choose between the two as you can't have them both.
Maybe what you need is a carousel with ajax paginations that bypass caches, unfortunately, I'm not sure which one could do the same. Revslider has carousel but no ajax pagination, you could try essential grid like from here http://doc.freevision.me/rosie/how-to-create-a-single-row-portfolio-carousel-with-essential-grid/. But I'm not sure if it can bypass the cache.