Like everybody else, I think you need to optimize your images first. There shouldn't be any meaningful difference in visual quality between an image originally sized at 186 X 163 or a 600 X 565 image resized by Zencart to 186 X 163 as you have now.
I resized your necklace image to 186 X 175, with no loss in apparent quality, but a decrease in file size from 107Kb to 24.5 Kb.
You haven't mentioned the name of your host, which may have a considerable effect on page load times.


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