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I have a slideshow which will be displaying large 400px X 1000px images. I need to have thumbnails of each image in the slideshow, so I was wondering… will the page load faster if I simply use a second instance of the image but lower the width and height – will the page load the large image twice? Or would the page load faster if I load the HD image and a smaller thumbnail?
Generally, I would advise against using images that are larger than the intended use. I would, personally, definitely recommend serving a properly sized image. These recommendations are based less on page load time (as the difference in your case is probably negligible) and more about best practice.
A very handy php utility I’ve use a lot for stuff like this is timthumb