Image rescaling

Hi,
I love the simplicity of this plugin and thats why i purchased it! But I've found that it has a tremendous affect on my site speed. It loads the original product images instead of creating thumbnails! I thought this would be included. Why download a 1000x1000px image to html rescale it to 190px?!
I would kindly ask for the developer to consider fixing this by adding the ability to auto create thumbnails needed.