Today, after no apparent changes, my page views, admin operations, and generally all navigation in my blog (xpxboston.com) takes 7-10 seconds to load the page. This happens not just to me, but for all users. I don't believe that it is the web server or MySQL, since I have custom code on the same site, using custom tables in the blogs database, that respond almost immediately. I have no plug'ins that go to off-site services as far as I know, though it almost seems as though it might be going off-site and then timing out. Anyway, how does one go about debugging this type of issue? Any advise would be appreciated.