Photos in Web Design

Why do some websites have murky, grainy pictures while with other website designs everything is crisp and clear and inviting? The photographs I gave my designer looked all right when I gave them to my website designer, but the result hasn’t come out at all well. The page loading time is really slow, too, and I’m wondering if that has anything to do with the images and graphics. We spent so much time and effort (and money!) on getting everything to come out just right, but the result is . . . disappointing. Is there something my designer or I didn’t do right?
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