OK, I see it, too. I can’t exactly say what it is right now but using the Net panel of Safari’s built in debugging tool (accessible with keyboard shortcut Cmd+Option+I) I can see that these small images at the right in the “Recent works” section take a long time to load. And this is partly because they are way too big (in terms of file size) for their size (in terms of dimensions). You really need to optimize your images for the web. An image like inthewild.jpg should be like 3–4 KB, not 27.
You also have a lot of useless images that add no value to your site but add pageload, like the bottom2, 4, and 6 JPEGs and the ridiculous width of the contact/copyright image, most of which just consists of white space. Likewise, these horizontal double border images are a total waste of bandwidth. This could be a 1px wide background image that is repeated horizontally.
Fixing these issues might already speed up your site tremendously.
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