When you say slow to load do you mean slow to upload to the server or slow to download and display in the browser?
Are these jpgs for display on a web page or for downloading for printing?
How are you generating these jpgs? Photoshop has pretty good presets for outputting jpgs at "web" quality - that is for web display quality.
Another factor you should take into account is to make sure you upload them at the resolution you are going to display them at, unless you want to provide a "click for high detail" capability.
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