The site became dead slow the last days. The main reason was an update in a WordPress plugin called tinyMCE. Although the writer claims that he had fixed all things slowing down websites, rolling back to an earlier release is the solution that really works to return to the speed we were used to.
Another thing that looked like slowing down the site was the Facebook plugin, these “Like” buttons that were all over the site. Now that really didn’t slowed down the site because the call was asynchronous, fact was that it looked a bit strange that after a page was loaded, the page was reformatted again when the buttons arrived and were parsed. Almost nobody used these buttons, so now only the generic Facebook button in the header is still there.