I have just converted an existing site to WordPress. It seems rather slower than I'm used to for WordPress, but that could be because I am in the UK and the server is in the US. Other US-based WordPress sites don't seem slow from here, though.
Would anyone be good enough to try a few of the pages at http://www.orthopticsnwest.org.uk/? The top part of the pages seem to load okay, then there is a bit of a wait until the sidebar and footer complete the page.