Can websites be optimized for faster loading?

I have created a rather comprehensive website for nature, science and the environment in my region. I have tried to make it content rich with both text, links and photos for the broader, general population. I am,however, receiving complaints from about 25% of my subscribers that page load times are long, (sometimes very long) and that loading sometimes stops before continuing. A few of these say that pages won't load completely and one has said it has crashed his browser. Most others (75%) report absolutely no issues what-so-ever.
The website can be found at: http://web.mac.com/rwolfert/NJNature_Notes_Website/FrontPage.html
After questioning about 2 dozen readers, I have the feeling it has to do with the following (so far):
1-browsers…IE is the slowest by far with Safari and Firefox best. Safari renders pages best.
2-computer memory…I can't prove this yet but this seems a no-brainer. Anything less than 1 GB of memory is really not going to help with complex pages.
3-processor speed…this too should be obvious…newer machines will handle complex pages better
4-add-ons like drop shadows and reflections on images
5-and possibly, too many images on a given page
So, this leads to some questions about optimizing pages or an entire website.
1-Does the website have TOO many drop shadows, and/or photos?
2-Is there a way to optimize photos that have been resized so they are as small as they can be while not losing any screen resolution? I would imagine that when adding photos to a page that will play slideshows, that the images are automatically optimized for the page. But, images that are resized or masked on the page itself, are not. Is the answer here to process each of those kinds of images in iPhoto or Photoshop first, at the exact size? Would I have to set resolution in some way too?
3-Do I really have to 'dumb down' the site's graphics (drop shadows, etc.) for people with older and slower computers, and the 'wrong' browser?
Thanks for any help. I would really love to resolve this issue or, at least, give the complaining viewers an answer.
Rich

Something else I just thought of.
If you have other computers available (windows, too), would you please try the website there to see if platform or older vs. new computers make a big difference, different amounts of memory and/or processor speed, as well.
Note, I removed about 20 drop shadows and photo reflections from the Front Page of the website and I do seem to get about a 20% decrease in load time.
Thank you very much.
Rich

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