So image quality has a lot to do with the speed at which a website loads.  It has a lot to do with how it looks on the webpage as well.  It is a good idea to shrink down images and make them the size you want to display on the page and then give someone the option to view the larger version if they choose too.  By doing this you are being mindful of their bandwidth and it also looks better.

In Chrome this might not be noticeable but other browsers are not so forgiving when it comes to the degradation of images.  I have seen an image look fine in Chrome but when the same page is viewed in Firefox the image appears to be off a little.  I know 100k per image loading doesn't seem like a lot but if someone is on a phone and you have 10 images on a page that is a meg of bandwidth for each view which can add up to their bandwidth usage as well as yours being used unnecessarily.