I know the size (measurement) of thumbnails is smaller than medium or full size, however, I did a few test posts with thumbnail size and full size. I don't really see a big difference when viewing them. I think the thumbnails take a second to load (shows only half of the picture, and then the full size).
Is there an advantage to using thumbnail size, such as saving upload space, or other?
My blog is still new, but I want to save space. I do re-size all my images to 800x600 before uploading them to wordpress.com
The blog I need help with is cravingthis.wordpress.com.