Ok that’s ok.  I’ve got a question then, I hope i can explain it clearly:  At the moment I am using the full size image (which is 1000×667) as the featured image. So on that page it shows up as the thumb.  Would it help the page to load faster if I make a smaller size image (maybe 300×200) as the thumb?  Or would this be pointless because the portfolio page/wordpress automatically resizes the featured images already for me?