Those load figures do look a little high, but not overly so, given that DreamHost use NFS, which I believe tends to inflate the load figures slightly. I have seen the load on my server rise to similar levels with no detrimental effect on the speed of my sites.
I just checked your site again and this time it loaded reasonably quickly, no more than a few seconds for it to come up. Clicking a few menu items also resulted in reasonable response times, so it is possible that the load on your server is not constantly high. It is important for you to check the load levels at the times when your website is at its slowest.
If you see a fairly constant high server load, say above 6 or 7, then I suggest lodging a support request to DreamHost detailing your issue. They may be able to isolate the cause of the high load and remove it.
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