Hi Sue, one issue with your portfolio pages is they are hugely image intensive as stated by others and also of concern to yourself.
For example your commercial page has 13 x 5 thumbnail images = 65 images.
It also has 13 x 5 fullscale images = another 65 images.
As well, each image has a background image with a drop shadow. It's not a named image and therefore whilst very small, the image whilst exactly the same is loaded as a seperate image 65 times.
A lot of call's for images on the server.
65 x 3 = 195 calls.
As Acorn states Highslide is now old hat and probably not the best way forward.
With image intensive pages I think LazyLoading is the way to go. Acorn & Siran have covered this alternative very well in the past. What this entails is that images 'below the fold' ( The viewable area of the page) aren't loaded on page load, but delayed until you scroll down the page, loading each image as it comes into view. Far better than loading all images into the page whether they're viewed or not.
All that said, I'm not the person to implement it or show you how to do it. I can achieve it after many attempts on my own but I'd leave to the likes of Acorn & Siran to give precise examples.
DEMO This only loads the images as you scroll the page.
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