Within the last few days my site has developed a problem I can't figure out: The homepage at blog.drysdaleandco.com is suddenly extremely slow to load and when it does the links in the sidebars to categories and tags are missing.
However, on individual posts and pages the site looks as it should with the correct sidebar links.Eg: http://blog.drysdaleandco.com/2011/08/paperblanks-2012-agendas-now-in-stock.html
But if you click the category or tag links on those correct sidebars the load time is also very slow and the sidebar links may or may not disappear again (I seem to get different results with each new test).
I can't figure out why this has suddenly happened, or how to fix it. Any input would be greatly appreciated.