As you use WordPress, you may notice that page loads are taking longer and the site seems to grind along. It turns out that junk data may be piling up and slowing down your site. Sizlopedia explains that this junk may pile up as a result of plugins that were activated and then deactivated, too many useless categories, etc. Check out this post for some tips and plugins that can help you clean up and speed up your blog.
Connected Internet also has a list of links to articles that explain how to speed up your site.