Slow loading

Hi! The main problem with your images is, that they have too good quality, a lot of them are over 1M. You should use an image editor like Photoshop or GIMP, where you have the option to save down your images with lower qualities in a way, that a human eye couldn’t even see the difference.
So try to make them smaller, around 200k would be the best, but at that point there might will be a difference.

In the full version you could also have lazy loading option:
http://doc.smartslider3.com/article/66-advanced
which would make your slider only load as many images at once, as much you choose to load.